sceSha256
add files include in CMakeLists.txt and Android.mk.
Merge branch 'sceSha256' of https://github.com/daniel229/ppsspp into daniel229-sceSha256
Implement sceSha256Digest (untested)
Oops
Merge pull request #7146 from hrydgard/sha256

Quick implementation of sceSha256Digest from #7134