[boost-test] Link failure for "Header-only with multiple translation units" case on x64-windows

**Describe the bug**

Linker fails when using the `boost-test` in the ["Header-only with multiple translation units"](https://www.boost.org/doc/libs/1_84_0/libs/test/doc/html/boost_test/adv_scenarios/single_header_customizations/multiple_translation_units.html) scenario on `x64-windows`.

**Environment**
- OS: Windows 11 Pro 23H2
- Compiler: Visual Studio 2022 17.9.1 with builtin vcpkg

**To Reproduce**
1. The `CMakeLists.txt` file:
```CMake
cmake_minimum_required(VERSION 3.21)
project(boost-test-demo CXX)
find_package(Boost REQUIRED)
add_executable(main main.cpp test.cpp)
target_link_libraries(main Boost::boost)
```

2. The `vcpkg.json` file:
```JSON
{
"$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
"builtin-baseline": "37c3e63a1306562f7f59c4c3c8892ddd50fdf992",
"dependencies": [
"boost-test"
]
}
```

3. Run in Developer Command Prompt:
```cmd
cmake -B build --toolchain "%VCPKG_ROOT%\scripts\buildsystems\vcpkg.cmake"
cmake --build build --config Release
```

**Failure log**
```
MSBuild version 17.9.5+33de0b227 for .NET Framework

1>Checking Build System
Building Custom Rule C:/Users/hebasto/boost-test/CMakeLists.txt
main.cpp
test.cpp
Generating Code...
LINK : warning LNK4217: symbol '??1lazy_ostream@unit_test@boost@@UEAA@XZ (public: virtual __cdecl boost::unit_test::lazy_ostream::~lazy_ostream(void))' defined in 'main.obj' is imported by 'test.obj' in function '"public: virtual __cdecl boost::unit_test::lazy_ostream_impl,class boost::unit_test::basic_cstring const &>::~lazy_ostream_impl,class boost::unit_test::basic_cstring const &>(void)" (??1?$lazy_ostream_impl@Vlazy_ostream@unit_test@boost@@V?$basic_cstring@$$CBD@23@AEBV423@@unit_test@boost@@UEAA@XZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '?set_checkpoint@unit_test_log_t@unit_test@boost@@QEAAXV?$basic_cstring@$$CBD@23@_K0@Z (public: void __cdecl boost::unit_test::unit_test_log_t::set_checkpoint(class boost::unit_test::basic_cstring,unsigned __int64,class boost::unit_test::basic_cstring))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '?instance@unit_test_log_t@unit_test@boost@@SAAEAV123@XZ (public: static class boost::unit_test::unit_test_log_t & __cdecl boost::unit_test::unit_test_log_t::instance(void))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl boost::unit_test::`anonymous namespace'::`dynamic initializer for 'unit_test_log''(void)" (??__Eunit_test_log@?A0x2606b0c1@unit_test@boost@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '??1assertion_result@test_tools@boost@@QEAA@XZ (public: __cdecl boost::test_tools::assertion_result::~assertion_result(void))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '?report_assertion@tt_detail@test_tools@boost@@YA_NAEBVassertion_result@23@AEBVlazy_ostream@unit_test@3@V?$basic_cstring@$$CBD@63@_KW4tool_level@123@W4check_type@123@3ZZ (bool __cdecl boost::test_tools::tt_detail::report_assertion(class boost::test_tools::assertion_result const &,class boost::unit_test::lazy_ostream const &,class boost::unit_test::basic_cstring,unsigned __int64,enum boost::test_tools::tt_detail::tool_level,enum boost::test_tools::tt_detail::check_type,unsigned __int64,...))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '?instance@collector_t@decorator@unit_test@boost@@SAAEAV1234@XZ (public: static class boost::unit_test::decorator::collector_t & __cdecl boost::unit_test::decorator::collector_t::instance(void))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl `dynamic initializer for 'test2_registrar310''(void)" (??__Etest2_registrar310@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '??0test_case@unit_test@boost@@QEAA@V?$basic_cstring@$$CBD@12@0_KAEBV?$function@$$A6AXXZ@2@@Z (public: __cdecl boost::unit_test::test_case::test_case(class boost::unit_test::basic_cstring,class boost::unit_test::basic_cstring,unsigned __int64,class boost::function const &))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl `dynamic initializer for 'test2_registrar310''(void)" (??__Etest2_registrar310@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '?normalize_test_case_name@ut_detail@unit_test@boost@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$basic_cstring@$$CBD@23@@Z (class std::basic_string,class std::allocator > __cdecl boost::unit_test::ut_detail::normalize_test_case_name(class boost::unit_test::basic_cstring))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl `dynamic initializer for 'test2_registrar310''(void)" (??__Etest2_registrar310@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
LINK : warning LNK4217: symbol '??0auto_test_unit_registrar@ut_detail@unit_test@boost@@QEAA@PEAVtest_case@23@AEAVcollector_t@decorator@23@K@Z (public: __cdecl boost::unit_test::ut_detail::auto_test_unit_registrar::auto_test_unit_registrar(class boost::unit_test::test_case *,class boost::unit_test::decorator::collector_t &,unsigned long))' defined in 'main.obj' is imported by 'test.obj' in function '"void __cdecl `dynamic initializer for 'test2_registrar310''(void)" (??__Etest2_registrar310@@YAXXZ)' [C:\Users\hebasto\boost-test\build\main.vcxproj]
test.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static class boost::unit_test::lazy_ostream & __cdecl boost::unit_test::lazy_ostream::instance(void)" (__imp_?instance@lazy_ostream@unit_test@boost@@SAAEAV123@XZ) referenced in function "void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ) [C:\Users\hebasto\boost-test\build\main.vcxproj]
Hint on symbols that are defined and could potentially match:
"__declspec(dllimport) public: static class boost::unit_test::decorator::collector_t & __cdecl boost::unit_test::decorator::collector_t::instance(void)" (__imp_?instance@collector_t@decorator@unit_test@boost@@SAAEAV1234@XZ)
"__declspec(dllimport) public: static class boost::unit_test::unit_test_log_t & __cdecl boost::unit_test::unit_test_log_t::instance(void)" (__imp_?instance@unit_test_log_t@unit_test@boost@@SAAEAV123@XZ)
test.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: __cdecl boost::unit_test::lazy_ostream::lazy_ostream(bool)" (__imp_??0lazy_ostream@unit_test@boost@@IEAA@_N@Z) referenced in function "void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ) [C:\Users\hebasto\boost-test\build\main.vcxproj]
test.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl boost::test_tools::assertion_result::assertion_result(bool)" (__imp_??0assertion_result@test_tools@boost@@QEAA@_N@Z) referenced in function "void __cdecl test2_invoker(void)" (?test2_invoker@@YAXXZ) [C:\Users\hebasto\boost-test\build\main.vcxproj]
C:\Users\hebasto\boost-test\build\Release\main.exe : fatal error LNK1120: 3 unresolved externals [C:\Users\hebasto\boost-test\build\main.vcxproj]

```