[libpng16] Fixed manual assertion that all of our public macros begin with PNG_

Some such as PNGAPI begin with "PNG".

libpng-manual.txt

 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.0beta17 - March 6, 2012
+ libpng version 1.6.0beta17 - March 9, 2012
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.0beta17 - March 6, 2012
+ libpng versions 0.97, January 1998, through 1.6.0beta17 - March 9, 2012
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -4975,7 +4975,7 @@ above the comment that says
 
 To avoid polluting the global namespace, the names of all exported
 functions and variables begin with  "png_", and all publicly visible C
-preprocessor macros begin with "PNG_".  We request that applications that
+preprocessor macros begin with "PNG".  We request that applications that
 use libpng *not* begin any of their own symbols with either of these strings.
 
 We put a space after each comma and after each semicolon
@@ -5002,7 +5002,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 XVI. Y2K Compliance in libpng
 
-March 6, 2012
+March 9, 2012
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

libpng.3

-.TH LIBPNG 3 "March 6, 2012"
+.TH LIBPNG 3 "March 9, 2012"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.6.0beta17
 .SH SYNOPSIS
@@ -1007,7 +1007,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.0beta17 - March 6, 2012
+ libpng version 1.6.0beta17 - March 9, 2012
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1018,7 +1018,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.0beta17 - March 6, 2012
+ libpng versions 0.97, January 1998, through 1.6.0beta17 - March 9, 2012
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -5983,7 +5983,7 @@ above the comment that says
 
 To avoid polluting the global namespace, the names of all exported
 functions and variables begin with  "png_", and all publicly visible C
-preprocessor macros begin with "PNG_".  We request that applications that
+preprocessor macros begin with "PNG".  We request that applications that
 use libpng *not* begin any of their own symbols with either of these strings.
 
 We put a space after each comma and after each semicolon
@@ -6010,7 +6010,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XVI. Y2K Compliance in libpng
 
-March 6, 2012
+March 9, 2012
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -6278,7 +6278,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.0beta17 - March 6, 2012:
+Libpng version 1.6.0beta17 - March 9, 2012:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6301,7 +6301,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.0beta17, March 6, 2012, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.0beta17, March 9, 2012, are
 Copyright (c) 2004,2006-2007 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
@@ -6400,7 +6400,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-March 6, 2012
+March 9, 2012
 
 .\" end of man page