Please review this trivial fix of a build failure on MacOSX when compiling with C++11/14 enabled. An int value is being used in an initializer where an unsigned int is needed, which is not permitted since C++11. The solution taken is to cast the value in the initializer. A "better" solution would be to change the type of the value, but that has substantial fannout because there are many places in our code where signed ints were used instead of the unsigned ints used by the underlying MacOSX framework.
CR: https://bugs.openjdk.java.net/browse/JDK-8211962 Webrev: http://cr.openjdk.java.net/~kbarrett/8211962/open.00/ Testing: mach5 tier1 on MacOSX (really just verifying it builds).
