wl_display_dispatch() just dispatches events that are in
default and display queues and if there are no events,
then it will wait for them. But only dispatching
the events doesn't guarantee that we got all the global announcements,
we need to do sync too. Therefore use wl_display_roundtrip() instead
of wl_display_dispatch().
Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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