[9] Review request for 8165705: Robot.createScreenCapture produces black screenshot on Oracle Linux 7.1

[Alexander Zvegintsev]

Hello,

please review the fix

http://cr.openjdk.java.net/~azvegint/jdk/9/8165705/00/

for the issue

https://bugs.openjdk.java.net/browse/JDK-8165705

Gtk is now default option for taking screenshots with Robot.

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Thanks,
Alexander.