[9] Review Request: 8141553 JDK fails to build with Xcode 7 on 10.11

[Sergey Bylokhov]

Hello.

Please review one more iteration of the fix of warnings in awt on osx.
The fix was contributed by Chris Bensen.

Bug: https://bugs.openjdk.java.net/browse/JDK-8141553
Webrev can be found at: http://cr.openjdk.java.net/~serb/8141553/webrev.00


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Best regards, Sergey.