[libpng15] Simplified read/write API initial version; basic read/write tested

on a variety of images, limited documentation (in the header file.)
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index a8e12b0..5f2c5be 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -3,7 +3,7 @@
 
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.5.7beta02 - November 8, 2011 */
+/* Libpng 1.5.7beta02 - November 8, 2011 */
 
 /* Copyright (c) 1998-2011 Glenn Randers-Pehrson */
 
@@ -54,6 +54,8 @@
 #define PNG_FIXED_POINT_SUPPORTED
 #define PNG_FLOATING_ARITHMETIC_SUPPORTED
 #define PNG_FLOATING_POINT_SUPPORTED
+#define PNG_FORMAT_AFIRST_SUPPORTED
+#define PNG_FORMAT_BGR_SUPPORTED
 #define PNG_gAMA_SUPPORTED
 #define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 #define PNG_hIST_SUPPORTED
@@ -126,6 +128,12 @@
 #define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
 #define PNG_SETJMP_SUPPORTED
 #define PNG_SET_USER_LIMITS_SUPPORTED
+#define PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
+#define PNG_SIMPLIFIED_READ_BGR_SUPPORTED
+#define PNG_SIMPLIFIED_READ_SUPPORTED
+#define PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
+#define PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
+#define PNG_SIMPLIFIED_WRITE_SUPPORTED
 #define PNG_sPLT_SUPPORTED
 #define PNG_sRGB_SUPPORTED
 #define PNG_STDIO_SUPPORTED