Simplify macOS linking by using clang as linker driver - formatted - #72
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The existing macOS linker configuration passed raw ld64 flags that don't work when using clang as the linker driver. This simplifies macOS linking by using clang, which automatically handles SDK detection, system library linking, and architecture flags. Changes: - Use clang instead of ld/ld64.lld on macOS - Change -dylib to -dynamiclib (clang syntax) - Remove manual -syslibroot and -platform_version flags (clang handles these) - Simplify target specs to only pass -Wl,-undefined,dynamic_lookup - Add build.rs to embed LLVM library rpath for runtime linking - Add MacPorts installation instructions to configure script Tested on macOS with MacPorts LLVM 18 and 21 on Apple Silicon (M1).
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