[github] Update workaround for building on macos-10.15 GitHub virtual environment.

Author: neboat

.github/workflows/llvm-project-tests.yml

@@ -21,7 +21,7 @@ concurrency:
 
 env:
   # Workaround for build faliure on Mac OS X: llvm.org/PR46190, https://github.com/actions/virtual-environments/issues/2274
-  CPLUS_INCLUDE_PATH: /usr/local/Cellar/llvm@13/13.0.1/include/c++/v1:/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include
+  CPLUS_INCLUDE_PATH: /usr/local/Cellar/llvm/14.0.6/include/c++/v1:/usr/local/Cellar/llvm@13/13.0.1/include/c++/v1:/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include
 
 jobs:
   lit-tests:
@@ -41,6 +41,10 @@ jobs:
         uses: llvm/actions/setup-windows@main
         with:
           arch: amd64
+      - name: Check macOS (for debugging)
+        if: startsWith(matrix.os, 'macos')
+        run: |
+          find /usr/local -name "cmath*"
       - name: Install Ninja
         uses: llvm/actions/install-ninja@main
       - uses: actions/checkout@v1