[libpng17] Update CHANGES and ANNOUNCE about pngcp; sync timepng.c with libpng16

png.h

@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.7.0beta80, May 5, 2016
+ * libpng version 1.7.0beta80, May 6, 2016
  *
  * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -12,7 +12,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.7.0beta80, May 5, 2016:
+ *   libpng versions 0.97, January 1998, through 1.7.0beta80, May 6, 2016:
  *     Glenn Randers-Pehrson.
  *   See also "Contributing Authors", below.
  */
@@ -25,7 +25,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.0.7, July 1, 2000, through 1.7.0beta80, May 5, 2016, are
+ * libpng versions 1.0.7, July 1, 2000, through 1.7.0beta80, May 6, 2016, are
  * Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
  * derived from libpng-1.0.6, and are distributed according to the same
  * disclaimer and license as libpng-1.0.6 with the following individuals
@@ -218,7 +218,7 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 5, 2016
+ *    May 6, 2016
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
@@ -288,7 +288,7 @@
 /* Version information for png.h - this should match the version in png.c */
 #define PNG_LIBPNG_VER_STRING "1.7.0beta80"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.7.0beta80 - May 5, 2016\n"
+     " libpng version 1.7.0beta80 - May 6, 2016\n"
 
 #define PNG_LIBPNG_VER_SONUM   17
 #define PNG_LIBPNG_VER_DLLNUM  17