hg: openjfx/8/graphics/rt: Updated gradle build to work on linux

[hang.vo at oracle.com]

Changeset: d1dbad1c94b9
Author:    rbair
Date:      2013-03-13 09:41 -0700
URL:       http://hg.openjdk.java.net/openjfx/8/graphics/rt/rev/d1dbad1c94b9

Updated gradle build to work on linux

! build.gradle