[gimp/osx-build] OS X build: fix zlib dependency

[Sven Claussner <sclaussner src gnome org>]

commit 0715c0d8b5bc8183f3f73f08aaaa1780d1f9625a
Author: Sven Claussner <sclaussner src gnome org>
Date:   Thu May 29 17:12:31 2014 +0200

    OS X build: fix zlib dependency
    
    Correct source download URL.

 build/osx/gimp.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/osx/gimp.modules b/build/osx/gimp.modules
index ac95e0b..caa7e99 100755
--- a/build/osx/gimp.modules
+++ b/build/osx/gimp.modules
@@ -1230,7 +1230,7 @@
        </autotools>
 
        <autotools id="zlib" autogen-sh="configure">
-               <branch repo="sourceforge" module="libpng/zlib-1.2.8.tar.bz2"
+               <branch repo="sourceforge" module="libpng/zlib/1.2.8/zlib-1.2.8.tar.xz"
                        version="1.2.8" />
        </autotools>