[gimp] build/win: Upgrade libpng to 1.6.8

[Michael Henning <mhenning src gnome org>]

commit 3e63af27322dfa91b8c485410161f4c15d674573
Author: Michael Henning <drawoc darkrefraction com>
Date:   Sun Jan 19 11:21:05 2014 -0500

    build/win: Upgrade libpng to 1.6.8

 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 edd0ab5..e0b8584 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="1.6.7" repo="sf.net"
-                       module="libpng/libpng16/1.6.7/libpng-1.6.7.tar.xz"
-                       hash="md5:7023a9eacd7b6a3eb95761a2f574d456">
+       <branch version="1.6.8" repo="sf.net"
+                       module="libpng/libpng16/1.6.8/libpng-1.6.8.tar.xz"
+                       hash="md5:51ce71a1642cdde1f4485a7ff82193c0">
        </branch>
        <dependencies>
                <dep package="zlib"/>