CI-mingw.yml: removed MinGW setup step since it is pre-installed

Author: firewave

.github/workflows/CI-mingw.yml

@@ -14,7 +14,7 @@ jobs:
   build_mingw:
     strategy:
       matrix:
-        os: [windows-2019] # fails to download with "windows-2022"
+        os: [windows-2019, windows-2022]
         arch: [x64] # TODO: fix x86 build?
       fail-fast: false
 
@@ -23,11 +23,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up MinGW
-        uses: egor-tensin/setup-mingw@v2
-        with:
-          platform: ${{ matrix.arch }}
-
       # MinGW will always link the binaries even if they already exist. The linking is also extremely slow. So just run the "check" target which includes all the binaries.
       - name: Build all and run test
         run: |