Check for JavaFX before trying to build JavaFX components. JavaFX will be removed from JDK 11
Check for JavaFX before trying to build JavaFX components. JavaFX will be removed from JDK 11

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1834773 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: e9444884e1dc07569a5835e773ac4b7762ff191c
ham1/jmeter,ham1/jmeter,ham1/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter