[PATCH xserver] travis: Also build on OSX

[Eric Anholt]

Jon Turney <jon.turney at dronecode.org.uk> writes:

> Signed-off-by: Jon Turney <jon.turney at dronecode.org.uk>

Thanks for doing this!  I'll want to convert it to meson some day, but
it'll be a lot easier now that we have travis in place.

remote: I: patch #178342 updated using rev c30eca688781deb06b25a6a08297cb855aeb6ed2.
remote: I: patch #178352 updated using rev 0b00440678fa22c1c1ca4a292b67db3ab8676969.
remote: I: 2 patch(es) updated to state Accepted.
To git+ssh://git.freedesktop.org/git/xorg/xserver
   2c2e1b6f5775..0b00440678fa  HEAD -> master
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