<AWT Dev> [9] Review request for 8074921: OS X build broken by reference to XToolkit

[Alexander Zvegintsev]

Hello,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8074921/00/
for the issue
https://bugs.openjdk.java.net/browse/JDK-8074921

This fix removes reference to XToolkit from UNIXToolkit and moves 
awtLock to native.

-- 
Thanks,

Alexander.