[gtk-osx] Add webkit tarball repository, needed for building webkit from tarball.

[John Ralls <jralls src gnome org>]

commit 0082f53dfc5593091f555834eaf78cf94d666c2e
Author: John Ralls <jralls ceridwen us>
Date:   Sat Jun 20 13:37:22 2015 -0700

    Add webkit tarball repository, needed for building webkit from tarball.

 modulesets-unstable/gtk-osx-unsupported.modules |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/modulesets-unstable/gtk-osx-unsupported.modules b/modulesets-unstable/gtk-osx-unsupported.modules
index 5f207a5..ad7376b 100644
--- a/modulesets-unstable/gtk-osx-unsupported.modules
+++ b/modulesets-unstable/gtk-osx-unsupported.modules
@@ -18,6 +18,8 @@
   <repository type='svn' name='libproxy.google.com'
               href='http://libproxy.googlecode.com/svn/'
               tags-template="tags/%(tag)s"/>
+  <repository type="tarball" name="webkit.org"
+              href="http://www.webkitgtk.org/releases/"/>
   <repository type="svn" name="svn.webkit.org"
              href="http://svn.webkit.org/repository/"/>
   <repository type="git" name="git.webkit.org"