Can't build test target on Windows

Can't build the test target on Windows machine.

**BinaryParsing version:** `0.0.1` or the `main` branch.
**Swift version:**
```
Swift version 6.2.3 (swift-6.2.3-RELEASE)
Target: x86_64-unknown-windows-msvc
Build config: +assertions
```

### Checklist
- [x] If possible, I've reproduced the issue using the `main` branch of this package
- [x] I've searched for [existing GitHub issues](https://github.com/apple/swift-binary-parsing/issues)

### Steps to Reproduce
1. Clone repo
2. Open it in VS Code
3. Try Build All

### Expected behavior
The project compiles.

### Actual behavior
Many errors from linker:
```
> C:\Users\Hemet\AppData\Local\Programs\Swift\Toolchains\6.2.3+Asserts\usr\bin\swift.exe build --build-tests -Xlinker -debug:dwarf
Building for debugging...
Internal Error: dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "Corrupted JSON", underlyingError: Optional(unexpected end of file)))
Internal Error: dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "Corrupted JSON", underlyingError: Optional(unexpected end of file)))
lld-link: error: duplicate symbol: $s11SwiftSyntax0B8ProtocolP0aB14MacroExpansionE6expand6macros2in16indentationWidthAA0B0VSDySS0aB6Macros0D0_pXpG_qd__AA6TriviaVSgtAK0dE7ContextRd__lF
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)
lld-link: error: duplicate symbol: $s11SwiftSyntax0B8ProtocolP0aB14MacroExpansionE6expand6macros16contextGenerator16indentationWidthAA0B0VSDySS0aB6Macros0D0_pXpG_qd__AJcAA6TriviaVSgtAK0dE7ContextRd__lF
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
lld-link: error: duplicate symbol: $s11SwiftSyntax0B8ProtocolP0aB14MacroExpansionE6expand10macroSpecs16contextGenerator16indentationWidthAA0B0VSDySSAD0D4SpecVG_qd__AJcAA6TriviaVSgt0aB6Macros0dE7ContextRd__lF
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC13removingWhereACSb0aB00eB0Vc_tcfC
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC13removingWhereACSb0aB00eB0Vc_tcfc
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC5visity0aB00e4ListB0VAGF
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC5visity0aB005TokenB0VAGF
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC8viewModeAC0aB00b8TreeViewH0O_tcfC
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverCfE
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverCfd
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverCfD
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverCMa
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion0C11SystemErrorOs0F0AAMc
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverCMn
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion0C6SystemVMa
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion0C11SystemErrorOMa
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC8viewModeAC0aB00b8TreeViewH0O_tcfc
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC9predicateySb0aB00eB0VcvpWvd
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion16AttributeRemoverC014triviaToAttachH9NextToken0aB06TriviaVvpWvd
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: duplicate symbol: $s25SwiftSyntaxMacroExpansion0C6SystemVMn
>>> defined at E:\\Projects\\swift-binary-parsing\\.build\\x86_64-unknown-windows-msvc\\debug\\SwiftSyntaxMacroExpansion-tool.build\\MacroSystem.swift.o
>>> defined at libMacroSupport.a(MacroSystem.swift.o)

lld-link: error: too many errors emitted, stopping now (use /errorlimit:0 to see all errors)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[126/127] Linking swift-binary-parsingPackageTests.xctest
```

Start by reproducing the reported `swift.exe build --build-tests -Xlinker -debug:dwarf` command on Windows from a fresh clone of the main branch. Inspect the package's test-target and SwiftSyntax macro build configuration, then verify that the test target links without duplicate symbols and completes successfully.

Written by the indexing model from the issue text.