CI: Remove clang format Mac check

It is kind of pointless to have the Mac clang format check
when there is already one on Linux.

.github/workflows/clang-format.yml

@@ -30,20 +30,3 @@ jobs:
         run: |
           ./formatcode.sh
           ./CI/check-format.sh
-
-  macos64:
-    runs-on: macos-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          submodules: 'recursive'
-
-      - name: Install clang-format
-        run: |
-          brew install clang-format
-
-      - name: Check the Formatting
-        run: |
-          ./formatcode.sh
-          ./CI/check-format.sh