[Android] Enable building CoreCLR for Android

[kotlarmilos]

Shipping

• [Android] Support static linking of CoreCLR on Android #114629
• Implement componentization of CoreCLR runtime #114737
• [Mobile] Implement CMake export module for CoreCLR on Android and Apple mobile #115362
• [Android] Implement post-build symbol stripping #115717
• [Android] Brotli static libraries missing in the coreclr android runtime pack from VMR #116297
• [Android] Investigate and reduce coreclr_static.a size #116531

Build

• [android] Update internal documentation on CoreCLR on Android experimental support #112034
• Beginnings of native Android build #110471
• Bring up android+coreclr windows build.  #112256
• Support cross-building on Windows
• Resolve TCP/IP EventPipe support on CoreCLR Android #111524
• Set ANDROID_PLATFORM internally in the build
• Remove duplicate defines for CORECLR_HOSTING_API_LINKAGE
• Export System.Security.Cryptography APIs for singlefilehost in CoreCLR build for Android #111523
• Fix libunwind errors in CoreCLR Android build #111527
• During cross build, the same obj directory is used for target and host libunwind compilation #111868
• Support CoreCLR builds for arm and x86 architectures
• [Android] fseeko and ftello not supported on arm32 & x86 below API level 24 without disabling _FILE_OFFSET_BITS=64 #111665
• [Android] Add support for named mutex on mobile platforms in CoreCLR #117760

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[steveisok]

@kotlarmilos I added an item to track building Android on Windows. Current state is not going to work.

[akoeplinger]

I have some changes on a branch somewhere that make building Android on Windows (using mono) almost work, I can upstream those.