Bump Weston's Meson requirement
We have quite some things waiting for a Meson version requirement bump:
- #180 wants Meson 0.50
- #269 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.
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