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Auto merge of #121426 - madsmtm:remove-cc-syslibroot, r=pnkfelix
Remove redundant `-Wl,-syslibroot`
Since `-isysroot` is set, [Clang already passes this when invoking the linker](https://github.com/llvm/llvm-project/blob/llvmorg-17.0.6/clang/lib/Driver/ToolChains/Darwin.cpp#L439-L442).
See https://github.com/rust-lang/rust/pull/56833 for when the `-isysroot` was originally added, but didn't remove the unnecessary linker flag.
CC `@BlackHoleFox`
r? shepmaster
