Travis: Re-enable build on Xcode - 6.4. This allows testing on 10.9.5 as well as older versions of libc++.
Travis: Re-enable build on Xcode - 6.4. This allows testing on 10.9.5 as well as older versions of libc++.

karies/cling,marsupial/cling,karies/cling,root-mirror/cling,marsupial/cling,marsupial/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,marsupial/cling,marsupial/cling,karies/cling,karies/cling,root-mirror/cling,karies/cling,karies/cling,marsupial/cling,root-mirror/cling