[GTK] Bump gnome-themes-standard to 3.6.0
https://bugs.webkit.org/show_bug.cgi?id=114155

Patch by Manuel Rego Casasnovas <rego@igalia.com> on 2013-04-08
Reviewed by Martin Robinson.

* gtk/jhbuild.modules: As now we depend on GTK+ 3.6.0 bump the
dependency of gnome-themes-standard accordingly.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147946 268f45cc-cd09-0410-ab3c-d52691b4dbfc