[master] Fix typo in pngconf.h

pngconf.h

 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.41beta09 - October 30, 2009
+ * libpng version 1.2.41beta09 - November 1, 2009
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -872,7 +872,7 @@
 #ifndef PNG_1_0_X
 /* Added at libpng-1.2.41 */
 #ifndef PNG_USER_CHUNK_CACHE_MAX
-#  define PNG_USER_CHUNK_CACHE_MAX 0x7ffffffLL
+#  define PNG_USER_CHUNK_CACHE_MAX 0x7fffffffL
 #endif
 #endif