hevc does not support skip_frame

[Carl Eugen Hoyos]

(videolan ticket 14000)
The hevc decoder does not support the -skip_frame option.

$ ffmpeg -skip_frame nointra -i fate-suite/hevc/paramchange_yuv420p_yuv420p10.hevc -f null -
ffmpeg version N-71515-ga40cee0 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      54. 22.101 / 54. 22.101
  libavcodec     56. 34.100 / 56. 34.100
  libavformat    56. 30.100 / 56. 30.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 14.100 /  5. 14.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, hevc, from 'fate-suite/hevc/paramchange_yuv420p_yuv420p10.hevc':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1056x8440, 25 fps, 25 tbr, 1200k tbn, 25 tbc
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf56.30.100
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1056x8440, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc56.34.100 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[null @ 0x361ae20] Encoder did not produce proper pts, making some up.
Input stream #0:0 frame changed from size:1056x8440 fmt:yuv420p to size:416x240 fmt:yuv420p10le
frame=  266 fps=173 q=0.0 Lsize=N/A time=00:00:10.64 bitrate=N/A
video:25kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[Carl Eugen Hoyos]

Implemented by Stefan in 05c1c79d3779ae53c50007c4812ec5195dc2c264