Bump Weston's Meson requirement

We have quite some things waiting for a Meson version requirement bump:

#180 wants Meson 0.50
#269 (closed) is waiting to be released in Meson: https://github.com/mesonbuild/meson/pull/5775
#293 (closed) would want Meson 0.49
#289 (closed) might benefit from Meson 0.50
#295 needs Meson 0.50.1

Could we bump the requirement and how far?

If we go for 0.50 or later, I have a vague recollection that we should pick a 0.x.1 at least for some fixes.

Edited Feb 20, 2020 by Pekka Paalanen

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