libmpcodecs/vf_qp: update to latest version from mplayer

Please see mplayer svn for authorship and individual commits
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/libmpcodecs/vf_qp.c

@@ -33,6 +33,7 @@
 
 #include "libavcodec/avcodec.h"
 #include "libavutil/eval.h"
+#include "libavutil/mem.h"
 
 
 struct vf_priv_s {