[libpng16] Fixed bad link to RFC2083 in png.5 (Nikola Forro).

ANNOUNCE

@@ -1,4 +1,4 @@
-Libpng 1.6.23rc02 - June 3, 2016
+Libpng 1.6.23rc03 - June 7, 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
 
-   1.6.23rc02.tar.xz (LZMA-compressed, recommended)
-   1.6.23rc02.tar.gz
+   1.6.23rc03.tar.xz (LZMA-compressed, recommended)
+   1.6.23rc03.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1623r02.7z  (LZMA-compressed, recommended)
-   lp1623r02.zip
+   lp1623r03.7z  (LZMA-compressed, recommended)
+   lp1623r03.zip
 
 Other information:
 
-   1.6.23rc02-README.txt
-   1.6.23rc02-LICENSE.txt
-   libpng-1.6.23rc02-*.asc (armored detached GPG signatures)
+   1.6.23rc03-README.txt
+   1.6.23rc03-LICENSE.txt
+   libpng-1.6.23rc03-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.22):
 
@@ -41,10 +41,13 @@ Version 1.6.23rc01 [June 2, 2016]
   Moved sse2 prototype from pngpriv.h to contrib/intel/intel_sse.patch.
   Added missing ")" in pngerror.c (Matt Sarrett).
 
-Version 1.6.23rc02 [June 3, 2016]
+Version 1.6.23rc02 [June 4, 2016]
   Fixed undefined behavior in png_push_save_buffer(). Do not call
     memcpy() with a null source, even if count is zero (Leon Scroggins III).
 
+Version 1.6.23 [June 7, 2016]
+  Fixed bad link to RFC2083 in png.5 (Nikola Forro).
+
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