libxvid: fix missing end of line character

Error introduced in 5ce7ca68b86856ee8e9d6530dffdadc4eca4f8d1.
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  libxvid: fix missing end of line character

Conflicts:
	libavcodec/libxvid.c

No change as the buggy modification wasnt merged, ffmpeg handles the
case where both lumi and variance masking are set, differently

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Fix compilation with --disable-everything --enable-decoder=rawvideo.