1. Add cmake support in CMakeLists.txt according to https://developer.android.com/ndk/guides/other_build_systems
2. Resolve symbols errors
3. Backport fixes from 438ed42311
> QEMU relies on two optimization for ppc64 and arm:
>
> 1. if(0) /* optimized code */
> 2. assert(0); /* optimized code */
>
> But the assert on mingw32 doesn't have noreturn attribute which prevents
> the second optimization and some code is reverted to the original code
> to fit in the first optimization.
>
> The assert implementation is copied from glib as qemu did.
Unfortunately, NDK also doesn't have an assert implementation qemu prefers.
mio