fix problem: cannot build x264 normal minimal Linux

parameters:
External library support:
  --disable-avs            disable avisynth support
  --disable-swscale        disable swscale support
  --disable-lavf           disable libavformat support
  --disable-ffms           disable ffmpegsource support
  --disable-gpac           disable gpac support

  There have no ffmpeg or libav when build x264, so no needed
  these parameters.

Signed-off-by: Steven Liu <lingjiujianke@gmail.com>
Merge pull request #56 from T-bagwell/master

fix problem: cannot build x264 normal minimal Linux