ci(macos-13): use system llvm

Author: fxliang

.github/workflows/macos-build.yml

@@ -35,9 +35,8 @@ jobs:
 
       - name: Configure build environment
         run: |
-          brew install llvm ninja
+          brew install ninja
           echo "CMAKE_GENERATOR=Ninja"  >> $GITHUB_ENV
-          echo "/usr/local/opt/llvm/bin" >> $GITHUB_PATH
           echo git_ref_name="$(git describe --always)" >> $GITHUB_ENV
 
       - name: Configure build variant