[Integrated] RFR: 8236733: Change JavaFX release version to 15

[Kevin Rushforth]

Changeset: a557dd95
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2020-01-10 13:19:21 +0000
URL:       https://git.openjdk.java.net/jfx/commit/a557dd95

8236733: Change JavaFX release version to 15

Reviewed-by: arapte

! build.properties
! modules/javafx.base/src/test/java/test/com/sun/javafx/runtime/VersionInfoTest.java