[libpng15] Bump version to libpng-1.5.16beta02

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.16beta01 - April 25, 2013
+Libpng 1.5.16beta02 - April 26, 2013
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.5.16beta01.tar.xz (LZMA-compressed, recommended)
-   1.5.16beta01.tar.gz
-   1.5.16beta01.tar.bz2
+   1.5.16beta02.tar.xz (LZMA-compressed, recommended)
+   1.5.16beta02.tar.gz
+   1.5.16beta02.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1516b01.7z  (LZMA-compressed, recommended)
-   lp1516b01.zip
+   lp1516b02.7z  (LZMA-compressed, recommended)
+   lp1516b02.zip
 
 Other information:
 
-   1.5.16beta01-README.txt
-   1.5.16beta01-LICENSE.txt
+   1.5.16beta02-README.txt
+   1.5.16beta02-LICENSE.txt
 
 Changes since the last public release (1.5.15):
 
@@ -35,6 +35,8 @@ Version 1.5.16beta01 [April 25, 2013]
     was switched 'off' as opposed to being explicitly disabled.
   Avoid a compiler warning about unused png_ptr in translate_gamma_flags()
 
+Version 1.5.16beta02 [April 26, 2013]
+
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