update ffmpeg sources from FFmpeg/master
remove obsolete patches.
[PATCH] Support-raw-dvdsub-palette-as-stored-on-normal-dvd-s
[PATCH] matroska-Check-return-value-of-avio_seek-and-avoid-m
[PATCH] asf hacks
[PATCH] if-av_read_packet-returns-AVERROR_IO-we-are-done.-ff
[PATCH] added-Ticket-7187-TV-Teletext-support-for-DVB-EBU-Te
[PATCH] Don't accept mpegts PMT that isn't current
[PATCH] Don't reparse PMT unless it's version has changed
[PATCH] Read-PID-timestamps-as-well-as-PCR-timestamps-to-fin
[PATCH] Get-stream-durations-using-read_timestamp
[PATCH] aacenc-add-recognized-profiles-array
[PATCH] changed: allow 4 second skew between streams in mov
[PATCH] fixed: memleak in mpegts demuxer on some malformed
 (??) mpegts files with too large pes packets
[PATCH] Speed up mpegts av_find_stream_info
[PATCH] dxva-h264 Fix dxva playback of streams that don't  start
 with an I-Frame.
[PATCH] add-public-version-of-ff_read_frame_flush
[PATCH] h264: expose h264 frame packing as stereo_mode metadata
DllAvCodec -> av_frame_get_metadata -> DllAvUtil
fix ffmpeg build scripts and dll's path