aux/android: support uncompressed native libs
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.
Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2153>
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