Disambiguate the macros used to disable fprintf/printf/puts functions.

Originally committed as revision 16790 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/internal.h

@@ -241,11 +241,11 @@ if((y)<(x)){\
 #define exit exit_is_forbidden
 #ifndef LIBAVFORMAT_BUILD
 #undef  printf
-#define printf please_use_av_log
+#define printf please_use_av_log_instead_of_printf
 #undef  fprintf
-#define fprintf please_use_av_log
+#define fprintf please_use_av_log_instead_of_fprintf
 #undef  puts
-#define puts please_use_av_log
+#define puts please_use_av_log_instead_of_puts
 #undef  perror
 #define perror please_use_av_log_instead_of_perror
 #endif