[gimp] build/win: Mark libmng as an optional dependency.

[Michael Henning <mhenning src gnome org>]

commit d6237f72ffaa11c397a27862351fce62dedbabc5
Author: Michael Henning <drawoc darkrefraction com>
Date:   Sun Nov 17 20:57:07 2013 -0500

    build/win: Mark libmng as an optional dependency.

 build/windows/jhbuild/gimp.moduleset |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/windows/jhbuild/gimp.moduleset b/build/windows/jhbuild/gimp.moduleset
index 36a7324..80d1b14 100644
--- a/build/windows/jhbuild/gimp.moduleset
+++ b/build/windows/jhbuild/gimp.moduleset
@@ -39,7 +39,6 @@
                <dep package="xz"/>
                <dep package="librsvg"/>
                <dep package="libexif"/>
-               <dep package="libmng"/>
                <dep package="iso-codes"/>
                <dep package="libwmf"/>
                <dep package="ghostscript"/>
@@ -47,6 +46,7 @@
        </dependencies>
        <suggests>
                <dep package="webkitgtk"/>
+               <dep package="libmng"/>
        </suggests>
 </metamodule>