add self-contained Homebrew bottle packages for macOS - #98
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Add `packages.brew.<version>` exposing Zig builds from Homebrew official binary bottles. These bottles carry macOS-specific patches that the upstream ziglang.org tarballs do not include. Homebrew bottles are dynamically linked against Homebrew-provided LLVM, LLD, and zstd. The bottles ship with @@HOMEBREW_PREFIX@@ relocation markers in their Mach-O load commands instead of real paths, expecting Homebrew to rewrite them at install time. To make the derivations fully self-contained without requiring a Homebrew installation at runtime, the builder downloads the dependency bottles too, then walks the dylib closure starting from the zig binary using otool -L. Each referenced non-system dylib is copied into $out/lib/brew/, its install name is rewritten to @rpath/, and the zig binary gets an rpath of @executable_path/../lib/brew. Bundled dylibs get @loader_path so they find each other. Every patched Mach-O is re-signed with an ad-hoc signature since install_name_tool invalidates the original code signature, and macOS kills unsigned arm64 binaries.
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packages.brew.<version>exposing Zig builds from Homebrew official binary bottles. These bottles carry macOS-specific patches that the upstream ziglang.org tarballs do not include.This includes a script to update but I'll just do this manually for new Zig releases since its infrequent and I don't fully trust the script.