Pekka Paalanen authored Feb 01, 2019 and Daniel Stone committed Feb 11, 2019

Explain how to use with Meson, as autotools is going away.

The instructions have been copied from
https://wayland.freedesktop.org/building.html

 .

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>