add gcc via choco

Author: pantor

.github/workflows/ci.yml

@@ -228,7 +228,8 @@ jobs:
             # Chocolatey GCC is broken on the windows-2019 image.
             # See: https://github.com/DaanDeMeyer/doctest/runs/231595515
             # See: https://github.community/t5/GitHub-Actions/Something-is-wrong-with-the-chocolatey-installed-version-of-gcc/td-p/32413
-            scoop install gcc --global
+            # scoop install gcc --global
+            choco install mingw
             echo "CC=gcc" >> $GITHUB_ENV
             echo "CXX=g++" >> $GITHUB_ENV
           } elseif ("${{ matrix.compiler }}" -eq "clang") {