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>

@@ -77,7 +77,9 @@ else
     cd $ff_current_dir &&
     rm -rf x264-snapshot-20131129-2245-stable && unzip -q ${ff_src_dir}/x264-snapshot-20131129-2245-stable.zip &&
     cd x264-snapshot-20131129-2245-stable && 
-    ./configure --prefix=${ff_release_dir} --disable-opencl --bit-depth=8 --enable-static && 
+    ./configure --prefix=${ff_release_dir} --disable-opencl --bit-depth=8 \
+        --enable-static --disable-avs  --disable-swscale  --disable-lavf \
+        --disable-ffms  --disable-gpac && 
     make ${SRS_JOBS} && make install
     ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build x264 failed"; exit 1; fi
 fi