[9] Review request for 8156491: Autodetect GTK version for JFX

[Semyon Sadetsky]

Hello Kevin & David,

Please review the fix for jfx9:

bug: https://bugs.openjdk.java.net/browse/JDK-8156491

webrev: http://cr.openjdk.java.net/~ssadetsky/8156491/webrev.00/

The fix implements the autodetect feature which protects JFX Glass 
toolkit from the crash caused by loading dynamic libs from different GTK 
versions into the same process on Linux platform.

--Semyon