Travis-CI: Update OSX building to the same as Linux
Travis-CI: Update OSX building to the same as Linux

We updated the Linux build script to leave some markers in the travis-ci
log '###', which makes it much easier to search for, and get to the
interesting things, so add that to the OS-X versions.

Signed-off-by: Robin Getz <c66e5a86ef9317cf35cecb2ed063996b2100ed4b@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio