[libpng16] Fixed dead link in man page

libpng-manual.txt

 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.19beta02 - July 30, 2015
+ libpng version 1.6.19beta02 - August 11, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 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 1.6.19beta02 - July 30, 2015
+ libpng versions 0.97, January 1998, through 1.6.19beta02 - August 11, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -75,7 +75,7 @@ to the PNG specification (second edition) but has some additional material.
 
 The PNG-1.0 specification is available
 as RFC 2083 <http://www.libpng.org/pub/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/TR/REC.png.html>.
+W3C Recommendation <http://www.w3.org/TR/REC-png-19961001/>.
 
 Some additional chunks are described in the special-purpose public chunks
 documents at <http://www.libpng.org/pub/png/documents/>.
@@ -5304,7 +5304,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 XVI. Y2K Compliance in libpng
 
-July 30, 2015
+August 11, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

libpng.3

-.TH LIBPNG 3 "July 30, 2015"
+.TH LIBPNG 3 "August 11, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.6.19beta02
 .SH SYNOPSIS
@@ -508,7 +508,7 @@ 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 1.6.19beta02 - July 30, 2015
+ libpng version 1.6.19beta02 - August 11, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
@@ -519,7 +519,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.19beta02 - July 30, 2015
+ libpng versions 0.97, January 1998, through 1.6.19beta02 - August 11, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -583,7 +583,7 @@ to the PNG specification (second edition) but has some additional material.
 
 The PNG-1.0 specification is available
 as RFC 2083 <http://www.libpng.org/pub/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/TR/REC.png.html>.
+W3C Recommendation <http://www.w3.org/TR/REC-png-19961001/>.
 
 Some additional chunks are described in the special-purpose public chunks
 documents at <http://www.libpng.org/pub/png/documents/>.
@@ -5812,7 +5812,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XVI. Y2K Compliance in libpng
 
-July 30, 2015
+August 11, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -6133,7 +6133,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.19beta02 - July 30, 2015:
+Libpng version 1.6.19beta02 - August 11, 2015:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6156,7 +6156,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.0.7, July 1, 2000, through 1.6.19beta02, July 30, 2015, are
+libpng versions 1.0.7, July 1, 2000, through 1.6.19beta02, August 11, 2015, are
 Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors:
@@ -6250,7 +6250,7 @@ the additional disclaimers inserted at version 1.0.7.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-July 30, 2015
+August 11, 2015
 
 .\" end of man page
 

png.5

-.TH PNG 5 "July 30, 2015"
+.TH PNG 5 "August 11, 2015"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -39,7 +39,7 @@ ftp://ds.internic.net/rfc/rfc2083.txt
 .br
 or (as a W3C Recommendation) at
 .br
-http://www.w3.org/TR/REC-png.html
+http://www.w3.org/TR/REC-png-961001
 .SH AUTHORS
 This man page: Glenn Randers-Pehrson
 .LP