[libpng16] Bump version to 1.6.8beta03

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.6.8beta02 - November 30, 2013
+Libpng 1.6.8beta03 - November 30, 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.
@@ -9,19 +9,19 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.8beta02.tar.xz (LZMA-compressed, recommended)
-   1.6.8beta02.tar.gz
+   1.6.8beta03.tar.xz (LZMA-compressed, recommended)
+   1.6.8beta03.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp168b02.7z  (LZMA-compressed, recommended)
-   lp168b02.zip
+   lp168b03.7z  (LZMA-compressed, recommended)
+   lp168b03.zip
 
 Other information:
 
-   1.6.8beta02-README.txt
-   1.6.8beta02-LICENSE.txt
+   1.6.8beta03-README.txt
+   1.6.8beta03-LICENSE.txt
    Gnupg/*.asc (PGP armored detached signatures)
 
 Changes since the last public release (1.6.7):
@@ -51,6 +51,8 @@ Version 1.6.8beta02 [November 30, 2013]
     to '"%s" m' to improve portability among compilers.
   Changed png_free_default() to free() in pngtest.c
 
+Version 1.6.8beta03 [November 30, 2013]
+
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