meson: bump the minimum supported version of meson to 0.51

We haven't reached our first public release of the meson build backend
yet, so we have lots of flexibility for this... and build dependencies
are easier to upgrade than runtime dependencies anyway.

Updating meson allows us to make use of a bunch of new features that
rewquire the latest version of meson.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

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