git: openjdk/jfx: 8231735: gradle checkrepo is obsolete and doesn't work with git

[duke]

Changeset: f595cc19
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2019-10-03 16:58:02 +0000
URL:       https://git.openjdk.java.net/jfx/commit/f595cc19

8231735: gradle checkrepo is obsolete and doesn't work with git

Reviewed-by: aghaisas

! build.gradle