android/compile-ijk.sh: support build armv7a only
android/ijkadk: FindClass does not persist in ART mode
android: SDL_AndroidAudioTrack -> SDL_Android_AudioTrack
android: sdl_native_window -> SDL_Android_NativeWindow
android: audio_track_fields_t -> AudioTrack_fields_t
android/MediaCodec: jni wrapper
android/Build: jni wrapper
android/MediaCodec: check API-level
ijksdl: simplify api level obtain
android/MediaCodec: fix methodid
android: remove unused ijkadk
android/ijkmedia: AMediaCodec like wrapper
android: SDL_Android_MediaCodec -> ADK_MediaCodec
android/ijkmedia: ADK_MediaCodec -> ASDK_MediaCodec
android/ijksdl: ASDK_MediaFormat