Avoid "HAVE_CMOV not defined" warning.

patch by Christophe Mutricy, xtophe nxtelevision com


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7443 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/common.h

@@ -120,7 +120,7 @@ static inline int av_log2_16bit(unsigned int v)
 /* median of 3 */
 static inline int mid_pred(int a, int b, int c)
 {
-#if HAVE_CMOV
+#ifdef HAVE_CMOV
     int i=b;
     asm volatile(
         "cmp    %2, %1 \n\t"