[libpng16] Bump version to 1.6.26beta03

ANNOUNCE

@@ -1,4 +1,4 @@
-Libpng 1.6.26beta02 - October 1, 2016
+Libpng 1.6.26beta03 - October 2, 2016
 
 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.
@@ -8,20 +8,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.26beta02.tar.xz (LZMA-compressed, recommended)
-   1.6.26beta02.tar.gz
+   1.6.26beta03.tar.xz (LZMA-compressed, recommended)
+   1.6.26beta03.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1626b02.7z  (LZMA-compressed, recommended)
-   lp1626b02.zip
+   lp1626b03.7z  (LZMA-compressed, recommended)
+   lp1626b03.zip
 
 Other information:
 
-   1.6.26beta02-README.txt
-   1.6.26beta02-LICENSE.txt
-   libpng-1.6.26beta02-*.asc (armored detached GPG signatures)
+   1.6.26beta03-README.txt
+   1.6.26beta03-LICENSE.txt
+   libpng-1.6.26beta03-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.25):
 
@@ -41,7 +41,7 @@ Version 1.6.26beta01 [September 26, 2016]
   Add tests/badcrc.png and tests/badadler.png to tests/pngtest.
   Merged pngtest.c with libpng-1.7.0beta84/pngtest.c
 
-Version 1.6.26beta02 [October 1, 2016]
+Version 1.6.26beta02 [September 30, 2016]
   Updated the documentation about CRC and ADLER32 handling.
   Quieted 117 warnings from clang-3.8 in pngtrans.c, pngread.c,
      pngwrite.c, pngunknown.c, and pngvalid.c.
@@ -49,6 +49,8 @@ Version 1.6.26beta02 [October 1, 2016]
     flag definitions in pngpriv.h from 0xnnnn to 0xnnnnU and trivial changes
     in png.c, pngread.c, and pngwutil.c.
 
+Version 1.6.26beta03 [October 2, 2016]
+
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