ffmpeg: enabled swscale by default (needed by openlibraries)

multimedia/ffmpeg/ffmpeg.conf

@@ -21,7 +21,7 @@ pkginstalled xvid && var_append extraconfopt " " "--enable-xvid"
 pkginstalled libtheora && var_append extraconfopt " " "--enable-theora"
 pkginstalled x264 && var_append extraconfopt " " "--enable-x264"
 pkginstalled faac && var_append extraconfopt " " "--enable-faac --enable-faad"
-var_append confopt " " "--enable-pthreads"
+var_append confopt " " "--enable-pthreads --enable-swscale"
 
 
 # Imlib2 support