Use llvm/actions/configure-llvm-project

This prevents to configure llvm on windows using mingw's gcc

Author: bwrsandman

.github/workflows/build.yml

@@ -9,10 +9,14 @@ jobs:
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: llvm/actions/setup-windows@main
+        if: ${{ runner.os == 'Windows' }}
       - name: Install Ninja
         uses: llvm/actions/install-ninja@main
       - name: Configure llvm cmake
-        run:  cmake -Bbuild -Sllvm -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_ENABLE_PROJECTS="lld;clang"
+        uses: llvm/actions/configure-llvm-project@main
+        with:
+          cmake_args: -Bbuild -Sllvm -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_ENABLE_PROJECTS="lld;clang"
       - name: Build llvm core
         run:  cmake --build build --target LLVMCore
       - name: Build clang