7130404: [macosx] "os.arch" value should be "x86_64" for compatibility with Apple JDK6 Summary: 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(). Reviewed-by: dcubed, phh, ohair, katleman Contributed-by: james.melvin@oracle.com

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