That github repo for Android comes from my modifications in OpenAL-Soft fork here: http://repo.or.cz/w/openal-soft/android.git (it includes NDK based makefile, so there is no need for cmake).
But you can use official OpenAL-Soft on Android by using OpenSL ES backend. OpenAL-Soft supports this backend for some time already and it works on Android just fine.
Just build the OpenAL-Soft library with Android NDK + CMake, make sure to include OpenSL ES backend. Of course this will limit you to Android 2.3 and up, but that is reasonable limitation.