hg: openjfx/jfx-dev/rt: 8228766: Platform.startup() deadlock on mac

[johan at lodgon.com]

Changeset: 67129a01074e
Author:    jvos
Date:      2019-08-09 18:02 +0200
URL:       https://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/67129a01074e

8228766: Platform.startup() deadlock on mac
Reviewed-by: kcr, arapte

! modules/javafx.graphics/src/main/java/javafx/application/Platform.java
! modules/javafx.graphics/src/main/native-glass/mac/GlassApplication.m
+ tests/system/src/test/java/test/com/sun/javafx/application/ConcurrentStartupTest.java
+ tests/system/src/test/java/test/com/sun/javafx/application/StaticStartupTest.java