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

Originally committed as revision 17632 to svn://svn.ffmpeg.org/ffmpeg/trunk

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, ...) { }