As reported in 193859, r368845 has introduced a regression through reverting
the logic of WANT_GTK218 checks as if c6 were already default.
Clear this up through restoring pre-368845 status quo.
Commitmessage:
Revert breaking Linux Mozilla suite with -f10 Revert a regression introduced in r368845 that causes Linux Mozilla suite not to work until CentOS 6.5 is default. PR: 193859 Submitted by: Jan Beich <jbeich@vfemail.net> Approved by: swills (mentor)