Review request for 8210359

[Johan Vos]

Please review webrev http://cr.openjdk.java.net/~jvos/8210359/webrev.00/
for https://bugs.openjdk.java.net/browse/JDK-8210359

(this allows to build OpenJFX SDK on platforms that don't include Swing,
e.g. armv6hf)