Rewrite build system to use Meson

[Ericson2314]

For the same reasons we've likewise converted other projects, as of late. Should be very easy --- I bet an LLM could do it even.

[Mic92]

We still need autotools around because patchelf is part of stdenv. Could be a second buildsystem...

[Ericson2314]

Doing as an additional build system instead.

[EricDeveaud]

please stay with plain configure//make

maybee I'm too old. ;-)