Updates the PNG library to 1.2.37, enables some functionality for O3D

third_party/libpng/png.h

Index: third_party/libpng/png.h
===================================================================
--- third_party/libpng/png.h	(revision 18910)
+++ third_party/libpng/png.h	(working copy)
@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.36 - May 7, 2009
+ * libpng version 1.2.37 - June 4, 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.)
@@ -8,7 +8,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.36 - May 7, 2009: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.37 - June 4, 2009: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -226,6 +226,9 @@
  *    1.2.36rc01              13    10236  12.so.0.36[.0]
  *    1.0.44                  10    10044  10.so.0.44[.0]
  *    1.2.36                  13    10236  12.so.0.36[.0]
+ *    1.2.37beta01-03         13    10237  12.so.0.37[.0]
+ *    1.2.37rc01              13    10237  12.so.0.37[.0]
+ *    1.2.37                  13    10237  12.so.0.37[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -255,7 +258,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.36, May 7, 2009, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.37, June 4, 2009, are
  * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -367,13 +370,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 7, 2009
+ *    June 4, 2009
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.36 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.37 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -429,9 +432,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.36"
+#define PNG_LIBPNG_VER_STRING "1.2.37"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.36 - May 7, 2009\n"
+   " libpng version 1.2.37 - June 4, 2009\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -439,7 +442,7 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 36
+#define PNG_LIBPNG_VER_RELEASE 37
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
@@ -467,7 +470,7 @@
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10236 /* 1.2.36 */
+#define PNG_LIBPNG_VER 10237 /* 1.2.37 */
 
 #ifndef PNG_VERSION_INFO_ONLY
 /* include the compression library's header */
@@ -1491,7 +1494,7 @@
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_36;
+typedef png_structp version_1_2_37;
 
 typedef png_struct FAR * FAR * png_structpp;