Hack: #undef printf so compilation works with DEBUG_IPMOVIE set to 1

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17632 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/ipmovie.c

@@ -40,6 +40,7 @@
 #define DEBUG_IPMOVIE 0
 
 #if DEBUG_IPMOVIE
+#undef printf
 #define debug_ipmovie printf
 #else
 static inline void debug_ipmovie(const char *format, ...) { }