External libraries are compiled with the latest NDK version (r9) with android-9 as API level using the recommended flags (see docs/).
External libraries are now compiled without the so version suffix because the NDK strips it at install time.
Static libraries of libsndfile and OpenAL-Soft have been removed because of their non-permissive license. It now uses their shared libraries.
NOTE: The audio module is disabled on MIPS arches because I was unable to compile OpenAL-Soft. Once the compilation issue fixed, I'll re-enable it.
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