fix glib dependency on SLE problem

svn path=/branches/mono-2-6/mono/; revision=155260

Author: Andrew Jorgensen

mono-core.spec.in

@@ -926,7 +926,6 @@ License:        LGPL v2.1 only
 Summary:        Mono development tools
 Group:          Development/Languages/Mono
 Requires:       mono-core == %version-%release
-Requires:       glib2-devel
 %if 0%{?monobuild}
 Requires:       libgdiplus0
 %else