stagefright: warnings be gone, some are now errors, use clang

cmds/stagefright/SimplePlayer.h

include/media/ICrypto.h

include/media/IMediaMetadataRetriever.h

include/media/IMediaPlayer.h

include/media/IStreamSource.h

include/media/MediaMetadataRetrieverInterface.h

include/media/MediaPlayerInterface.h

include/media/mediametadataretriever.h

include/media/stagefright/AACWriter.h

include/media/stagefright/AMRWriter.h

include/media/stagefright/AudioPlayer.h

include/media/stagefright/CameraSource.h

include/media/stagefright/DataSource.h

include/media/stagefright/MediaCodec.h

include/media/stagefright/MediaMuxer.h

include/media/stagefright/MediaWriter.h

include/media/stagefright/NuMediaExtractor.h

include/media/stagefright/Utils.h

media/libmediaplayerservice/nuplayer/GenericSource.h

media/libmediaplayerservice/nuplayer/NuPlayer.h