git: openjdk/jfx: 8227808: Make GTK3 libraries mandatory for building on Linux

[Ambarish Rapte]

Changeset: 4e005e4e
Author:    Ambarish Rapte <arapte at openjdk.org>
Date:      2019-12-18 17:05:51 +0000
URL:       https://git.openjdk.java.net/jfx/commit/4e005e4e

8227808: Make GTK3 libraries mandatory for building on Linux

Reviewed-by: jvos, kcr

! buildSrc/linux.gradle