CI: refactor windows_arm64_steps

Author: andyfaff

.github/windows_arm64_steps/action.yml

@@ -95,14 +95,17 @@ jobs:
         with:
           architecture: 'x86'
 
-      - name: Setup LLVM for Windows ARM64
+      - name: win_arm64 - set environment variables
         if: ${{ matrix.buildplat[1] == 'win_arm64' }}
-        uses: ./.github/windows_arm64_steps
+        run: |
+            echo "C:\Program Files\LLVM\bin" >> $env:GIHUB_PATH
+            echo "CC=clang-cl" >> $env:GITHUB_ENV
+            echo "CXX=clang-cl" >> $env:GITHUB_ENV
+            echo "FC=flang" >> $env:GITHUB_ENV
 
       - name: pkg-config-for-win
         if: runner.os == 'windows'
         run: |
-          choco install -y --no-progress --stoponfirstfailure --checksum 6004DF17818F5A6DBF19CB335CC92702 pkgconfiglite
           $CIBW = "${{ github.workspace }}/.openblas"
           # pkgconfig needs a complete path, and not just "./openblas since the
           # build is run in a tmp dir (?)

.github/workflows/wheels.yml

@@ -0,0 +1 @@
+pkgconf==2.5.1.post1

requirements/pkgconf_requirements.txt

@@ -61,4 +61,7 @@ fi
 # cibuildwheel doesn't install delvewheel by default
 if [[ $RUNNER_OS == "Windows" ]]; then
     python -m pip install -r $PROJECT_DIR/requirements/delvewheel_requirements.txt
+    # pkgconf - carries out the role of pkg-config.
+    # Alternative is pkgconfiglite that you have to install with choco
+    python -m pip install -r $PROJECT_DIR/requirements/pkgconf.txt
 fi