[png-mng-implement] libpng-1.0.57, 1.2.47, 1.4.9, and 1.5.9 are available

[Glenn Randers-P. <gl...@gm...>]

Libpng-1.0.57, 1.2.47, 1.4.9, and 1.5.9 are available from
ftp://ftp.simplesystems.org/pub/png/src
and from
http://libpng.sf.net

There are no changes from yesterday's rc01 releases.

The purpose of these releases is to fix the dangerous
CVE-2011-3026.  The libpng patch is different from
the one that was distributed earlier this week by
Chromium, in that the libpng user limit feature
is not crippled by the patch.

Glenn