Compatibility ndk r9d armeabi-v7a-hard APP_ABI building.

Fix APP_ABI=armeabi-v7a-hard ndk building problem.

I also create a pull request for native rep.

Just change ab.sh to test it:
-- NDK_MODULE_PATH=..:../native/ext $NDK/ndk-build -j3 $*
++ NDK_MODULE_PATH=..:../native/ext $NDK/ndk-build APP_ABI=armeabi-v7a-hard -j3 $*