meson: put 0.57 in a subdirectory

Meson is a delicate package. It needs some patches to properly work in Nixpkgs
and many packages have it as a dependency, from many small applications to
systemd (yay, mass rebuilds in sight!). Updating it is not a trivial and
harmless task.

Therefore, I took the paranoid way and encapsulate the current version in a
subdir, instead of the regular write-over procedure. This way, at the best we
can just remove the whole dir in the future, and at the worse we just maintain
duplicated code.

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