This brings in support for compressed soundfonts (sf3) for Android.
We need libsndfile.so, but it has various dependencies (libogg, libvorbis,
libflac), which are somewhat annoying to build if you do everything
by yourself.
Fortunately cerbero has recipes for libogg, libvorbis and libflac.
I added custom recipe for libsndfile in the referenced cerbero fork, and
therefore the changes could be just in cerbero world.
This set of changes implements audio drivers for Android, OpenSLES and Oboe. The changes in the original sources are kept minimal so that it should be easily maintained.