[clang] [Clang] Link libgcc_s.1.dylib when building for macOS 10.5 and older (PR #141401)

[Carlo Cabrera via cfe-commits]

https://github.com/carlocab commented:

Seems reasonable to me, but someone from Apple should probably be the one to ✅ this.

https://github.com/llvm/llvm-project/pull/141401