h264parse: Don't discard first AU delimiter
Don't throw away AU delimiter(s) that precede the SPS/PPS. Should fix MPEG-TS playback on iOS/Quicktime when muxing streams that already have AU delimiters. See https://bugzilla.gnome.org/show_bug.cgi?id=736213 for getting h264parse to insert AU delimiters when they don't already exist.
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