7130404: [macosx] "os.arch" value should be "x86_64" for compatibility with Apple JDK6

On Mac OS X, align system property "os.arch" with Apple legacy JDKs.  Also, improve os.name string matching by using .contains() method instead of .startsWith(). This fix spans multiple repositories.

Reviewed-by: dcubed, phh, ohair, katleman
1 file changed