RFR(S): JDK-8155009 jstack subtest of BasicLauncherTest should not be executed under OS X

[Dmitry Samersoff]

Everybody,

Please review the test changes.

http://cr.openjdk.java.net/~dsamersoff/JDK-8155009/webrev.01/

Coredump stackwalking is not implemented on OS X so skip corresponding test.

-Dmitry


-- 
Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the sources.