[12] JDK-8211280: [Linux] JavaFX build fails on Linux with gcc8

[Pankaj Bansal]

Hi Kevin/Murali,

Please review the fix.

JBS: https://bugs.openjdk.java.net/browse/JDK-8211280

webrev: http://cr.openjdk.java.net/~pbansal/8211280/webrev.00/

Regards,

Pankaj