[9] RFR of 8081843: (fs) FileStore.getTotalSpace returns unexpected results with >2TB file systems

[Brian Burkhalter]

Please review at your convenience.

Issue:  https://bugs.openjdk.java.net/browse/JDK-8081843
Patch:  http://cr.openjdk.java.net/~bpb/8081843/webrev.00/

Summary: On Mac OS X use BSD system call statfs() instead of Standard C Library 
call statvfs() to obtain file system size statistics.

Standard regression test run succeeded.

Thanks,

Brian