support uncompressed native libs for android
see https://developer.android.com/guide/topics/manifest/application-element#extractNativeLibs
if useLegacyPackaging in src/xrt/targets/openxr_android/build.gradle set to false, the full path of monado.so will become /data/app/../../base.apk!/lib/ABI/libopenxr_monado.so. The function getRuntimeSourceDir will get the wrong path.