build: enable the Android SDKs to be built and packaged

Build and package the Android SDKs on Windows as part of the toolchain
distribution. This requires further fine tuning to improve the DevEx,
however, this ensures that we do not backslide on the ability to build
and package the SDK as a starting point.

Author: compnerd

utils/build-windows-toolchain.bat

@@ -75,6 +75,7 @@ powershell.exe -ExecutionPolicy RemoteSigned -File %~dp0build.ps1 ^
   -SourceCache %SourceRoot% ^
   -BinaryCache %BuildRoot% ^
   -ImageRoot %BuildRoot% ^
+  -AndroidSDKs aarch64,armv7,i686,x86_64 ^
   %SkipPackagingArg% ^
   %TestArg% ^
   -Stage %PackageRoot% ^