patch 8.2.3770: new compiler warnings from clang-12 and clang-13 Commit: https://github.com/vim/vim/commit/dee78e1ce857985c06ff18e20daeadfe1622b8ae Author: ichizok <gclient.gaap@gmail.com> Date: Thu Dec 9 21:08:01 2021 +0000 patch 8.2.3770: new compiler warnings from clang-12 and clang-13 Problem: New compiler warnings from clang-12 and clang-13. Solution: Adjust CI and suppress some warnings. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/9314)