Include host compatibility library build directory
Include host compatibility library build directory

The SDK doesn't have the new compatibility library and the
crosscompile-with-hostlibs bootstrap configuration is failing.

This bootstrap configuration is the only one that does not fall back on
the host built compatibility libraries if it is not available in the
SDK.

apple/swift,roambotics/swift,benlangmuir/swift,apple/swift,glessard/swift,benlangmuir/swift,glessard/swift,apple/swift,roambotics/swift,glessard/swift,apple/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,glessard/swift,benlangmuir/swift,benlangmuir/swift,glessard/swift,roambotics/swift,apple/swift,benlangmuir/swift,apple/swift,roambotics/swift,glessard/swift