[gimp] build/win: Upgrade libpng to 1.6.12

[Michael Henning <mhenning src gnome org>]

commit cdb7f185a75ed956cbc5377c9aa0bcf0cec23eb6
Author: Michael Henning <drawoc darkrefraction com>
Date:   Tue Jul 29 22:56:52 2014 -0400

    build/win: Upgrade libpng to 1.6.12

 build/windows/jhbuild/imglibs.moduleset |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/build/windows/jhbuild/imglibs.moduleset b/build/windows/jhbuild/imglibs.moduleset
index d238808..f2c1f02 100644
--- a/build/windows/jhbuild/imglibs.moduleset
+++ b/build/windows/jhbuild/imglibs.moduleset
@@ -21,9 +21,9 @@
 </autotools>
 
 <autotools id="libpng" autogen-sh="configure">
-       <branch version="1.6.10" repo="sf.net"
-                       module="libpng/libpng16/1.6.10/libpng-1.6.10.tar.xz"
-                       hash="md5:5f414b20f683b1d96b163c89e3eff768">
+       <branch version="1.6.12" repo="sf.net"
+                       module="libpng/libpng16/1.6.12/libpng-1.6.12.tar.xz"
+                       hash="sha1:c3d54f9ab683d63218361487269380fb8e0cf3b6">
        </branch>
        <dependencies>
                <dep package="zlib"/>