feat: GitHub Actions MacOS Build (Clang) に対応

[gorockn]

See also: #25
CI実行ログ: https://github.com/gorockn/auriga/actions/runs/3073826718/jobs/4966202127

メモ:
以下エラーが出てしまうため、ビルド失敗ステータスは無視しています。
別プルリクで対策します。

Undefined symbols for architecture x86_64:
  "_socket_log2", referenced from:
      _process_fdset in socket.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[AppVeyorBot]

✅ Build auriga master-1.0.242-wyoveblv completed (commit c6fb041e7c by @gorockn)