hg: openjfx/8/graphics/rt: Gradle: fix build failure on linux-arm (follow up to RT-30498)

[hang . vo]

Changeset: 1b31a2387c75
Author:    kcr
Date:      2013-06-26 13:11 -0700
URL:       http://hg.openjdk.java.net/openjfx/8/graphics/rt/rev/1b31a2387c75

Gradle: fix build failure on linux-arm (follow up to RT-30498)

! build.gradle