[GitHub] Remove pkg-config workaround for macOS-10.5

Remove the workaround for
actions/runner-images#5900, which seems to
be resolved.

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

@@ -89,10 +89,6 @@ jobs:
           variant: sccache
       - name: Build and Test
         uses: llvm/actions/build-test-llvm-project@main
-        env:
-          # Workaround for https://github.com/actions/virtual-environments/issues/5900.
-          # This should be a no-op for non-mac OSes
-          PKG_CONFIG_PATH: /usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig//12
         with:
           cmake_args: '-GNinja -DLLVM_ENABLE_PROJECTS="${{ inputs.projects }}" -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLDB_INCLUDE_TESTS=OFF -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache ${{ inputs.extra_cmake_args }}'
           build_target: '${{ inputs.build_target }}'