ci: run pacman directly

Author: Berrysoft

.github/workflows/build.yml

@@ -51,12 +51,11 @@ jobs:
           fi
 
           sudo apt install -y "${PKGS[@]}"
-      - uses: msys2/setup-msys2@v2
+      - name: Install clang
         if: ${{ endsWith(matrix.setup.target, 'gnullvm') }}
-        with:
-          msystem: CLANG64
-          pacboy: clang:c
-          release: false
+        shell: bash
+        run: |
+          pacman -S --noconfirm mingw-w64-clang-x86_64-clang
       - name: Setup target
         if: ${{ matrix.setup.target }}
         run: rustup +${{ matrix.toolchain }} target install ${{ matrix.setup.target }}