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/rl.h

@@ -24,8 +24,8 @@
  * rl header.
  */
 
-#ifndef FFMPEG_RL_H
-#define FFMPEG_RL_H
+#ifndef AVCODEC_RL_H
+#define AVCODEC_RL_H
 
 #include <stdint.h>
 #include "bitstream.h"
@@ -83,4 +83,4 @@ static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
     return index + level - 1;
 }
 
-#endif /* FFMPEG_RL_H */
+#endif /* AVCODEC_RL_H */