SwiftMatrixSDK build error?

Nobody has claimed this yet.

I'm seeing an error after adding `pod "SwiftMatrixSDK"` to my project's Podfile:

```
In file included from /Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.m:17:
/Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.h:19:9: fatal error: 'MXJSONModel.h' file not found
#import "MXJSONModel.h"
```

Happens in Xcode 11.0 and 11.5. Anyone know what might be wrong?

Really annoying, since without the swift library, some objc methods are unavailable since they've been annotated with `NS_REFINED_FOR_SWIFT`.

Full output:
```
CompileC /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/Objects-normal/x86_64/MXWellknownIntegrations.o /Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler (in target 'SwiftMatrixSDK' from project 'Pods')
cd /Users/x/dev/element-chat-test/Pods
export LANG=en_US.US-ASCII
/Applications/Xcode_11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c -target x86_64-apple-ios9.0-simulator -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -std=gnu11 -fobjc-arc -fobjc-weak -fmodules -gmodules -fmodules-cache-path=/Users/x/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -fmodules-prune-interval=86400 -fmodules-prune-after=345600 -fbuild-session-file=/Users/x/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror=non-modular-include-in-framework-module -fmodule-name=SwiftMatrixSDK -Wno-trigraphs -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Werror=return-type -Wdocumentation -Wunreachable-code -Wno-implicit-atomic-properties -Werror=deprecated-objc-isa-usage -Wno-objc-interface-ivars -Werror=objc-root-class -Wno-arc-repeated-use-of-weak -Wimplicit-retain-self -Wduplicate-method-match -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wundeclared-selector -Wdeprecated-implementations -DPOD_CONFIGURATION_DEBUG=1 -DDEBUG=1 -DCOCOAPODS=1 -DOBJC_OLD_DISPATCH_PROTOTYPES=0 -isysroot /Applications/Xcode_11.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.0.sdk -fasm-blocks -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -g -Wno-sign-conversion -Winfinite-recursion -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wno-semicolon-before-method-body -Wunguarded-availability -fobjc-abi-version=2 -fobjc-legacy-dispatch -index-store-path /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Index/DataStore -iquote /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/SwiftMatrixSDK-generated-files.hmap -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/SwiftMatrixSDK-own-target-headers.hmap -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/SwiftMatrixSDK-all-non-framework-target-headers.hmap -ivfsoverlay /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/all-product-headers.yaml -iquote /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/SwiftMatrixSDK-project-headers.hmap -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/SwiftMatrixSDK/include -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/DerivedSources-normal/x86_64 -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/DerivedSources/x86_64 -I/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/DerivedSources -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/SwiftMatrixSDK -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/AFNetworking -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/GZIP -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/OLMKit -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/Realm -F/Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Products/Debug-iphonesimulator/libbase58 -include /Users/x/dev/element-chat-test/Pods/Target\ Support\ Files/SwiftMatrixSDK/SwiftMatrixSDK-prefix.pch -MMD -MT dependencies -MF /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/Objects-normal/x86_64/MXWellknownIntegrations.d --serialize-diagnostics /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/Objects-normal/x86_64/MXWellknownIntegrations.dia -c /Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.m -o /Users/x/Library/Developer/Xcode/DerivedData/element-chat-test-gqphdkcrgegkrvbebqyuobmvhwbs/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/SwiftMatrixSDK.build/Objects-normal/x86_64/MXWellknownIntegrations.o

In file included from /Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.m:17:
/Users/x/dev/element-chat-test/Pods/SwiftMatrixSDK/MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.h:19:9: fatal error: 'MXJSONModel.h' file not found
#import "MXJSONModel.h"
^~~~~~~~~~~~~~~
1 error generated.
```

Start by inspecting MatrixSDK/JSONModels/AutoDiscovery/MXWellknownIntegrations.h and the referenced MXJSONModel.h include, then reproduce the SwiftMatrixSDK CocoaPods build in Xcode 11. Check how the SDK's headers are exposed to this target. Done means the pod builds without the reported missing-header error.

Written by the indexing model from the issue text.