lixPackageSets.lix_2_92: init

This adapts #375030 now that #391402 is merged, as are the `editline`
(#391425, #391426) and `capnproto` (#391424) packaging updates.

This introduces https://lix.systems/blog/2025-01-18-lix-2.92-release/ in
nixpkgs.

This new release introduces a bunch of changes at the packaging level,
reliant on new features of Meson, new features of some of our
dependencies which are done in previous commits (editline & capnproto).

The approach taken here is that it's OK to add more dependencies than
required for older versions but not OK to break them.

Moreover, Lix is now load-bearing dependent on the Clang stdenv, it
cannot be compiled with GCC anymore.

An escape hatch is included but if this escape hatch is used, the user
is on its own and should probably work with GCC upstream to fix
miscompilations.

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