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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.