8160370: System.getProperty("os.version") returns "Unknown" on Mac Summary: Read SystemVersion.plist on pre-10.9 Mac OS Reviewed-by: bpb, ddehaven, gziemski, rriggs

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/