Globally rename the header inclusion guard names.

Consistently apply this rule: the guard name is obtained from the
filename by stripping the leading "lib", converting '/' and '.'  to
'_' and uppercasing the resulting name. Guard names in the root
directory have to be prefixed by "FFMPEG_".

Originally committed as revision 15120 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo_common.h

@@ -27,8 +27,8 @@
  * The simplest mpeg encoder (well, it was the simplest!).
  */
 
-#ifndef FFMPEG_MPEGVIDEO_COMMON_H
-#define FFMPEG_MPEGVIDEO_COMMON_H
+#ifndef AVCODEC_MPEGVIDEO_COMMON_H
+#define AVCODEC_MPEGVIDEO_COMMON_H
 
 #include "avcodec.h"
 #include "dsputil.h"
@@ -898,4 +898,4 @@ static inline void MPV_motion(MpegEncContext *s,
         MPV_motion_internal(s, dest_y, dest_cb, dest_cr, dir,
                             ref_picture, pix_op, qpix_op, 0);
 }
-#endif /* FFMPEG_MPEGVIDEO_COMMON_H */
+#endif /* AVCODEC_MPEGVIDEO_COMMON_H */