Chris Marchesi 2671215211 nix: fix package build
This fixes the Nix *package* build (read: not devShell, which is not
touched) so that it builds, and also conforms to what is generally seen
for a Zig project in nixpkgs.

The highlights:

* We use a Zig 0.12 derivation that I constructed from the Zig 0.11
  derivation, in addition to LLVM 17 updates found in
  NixOS/nixpkgs#258614. This specifically includes the patches that
  address ziglang/zig#15898, and also allows us to take advantage of the
  build hooks included in the Zig toolchain there.

* We pre-download the cache using "zig build --fetch" and a fixed-output
  derivation. This is similar to how the Go builders work in nixpkgs and
  I could see Zig ultimately going in a similar path, given that the
  fetcher part of the build system seems to be shaping up to having a Go
  module system-style DX (mind you, this is a naive opinion right now).

* Finally, cleaned up the derivation so that there's no special fixups
  happening outside of what is defined in the basic nixpkgs workflow.
  This is similar to other Zig projects I looked at (notably River) that
  seem to just include their dependencies in buildInputs and call it a
  day.

One specific change that is worth noting is that this changes the build
mode from ReleaseFast to ReleaseSafe - this is the current default
within the Zig build hook in nixpkgs. If we need ReleaseFast, we'll have
to override this.
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..
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