RFR: 8200313 : java/awt/Gtk/GtkVersionTest/GtkVersionTest.java fails

[Phil Race]

Bug: https://bugs.openjdk.java.net/browse/JDK-8200313
Webrev: http://cr.openjdk.java.net/~prr/8200313/

This test should have been updated when I switched the default
but it was overlooked.

-phil.