Updating .travis.yml to attempt an OS X build again.
Updating .travis.yml to attempt an OS X build again.

trailofbits/mcsema,jcranmer/mcsema,chubbymaggie/mcsema,chubbymaggie/mcsema,trailofbits/mcsema,trailofbits/mcsema,alessandrogario/mcsema,jcranmer/mcsema,chubbymaggie/mcsema,trailofbits/mcsema,jcranmer/mcsema,jcranmer/mcsema,chubbymaggie/mcsema,alessandrogario/mcsema,alessandrogario/mcsema,alessandrogario/mcsema