Draft: fix: update android makefile to support modern NDK
I want to update an Android app, currently it's very much outdated, build in mind for Android 4.x.
Standalone toolchains are obsolete and now Google recommends to use it like described here: https://developer.android.com/ndk/guides/other_build_systems
I am not very good with C/C++, but after hours of debug I was able to compile with the latest Android NDK r25c.
Would like to listen some feedback.