Downgrade openmp version in CI.

    - name: build-openmp

      if: steps.cache-openmp.outputs.cache-hit != 'true'

      run: |

        wget https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.4/openmp-15.0.4.src.tar.xz

        tar -xf openmp-15.0.4.src.tar.xz

        cd openmp-15.0.4.src

        wget https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/openmp-14.0.0.src.tar.xz

        tar -xf openmp-14.0.0.src.tar.xz

        cd openmp-14.0.0.src

        sed -i'' -e '/.size __kmp_unnamed_critical_addr/d' runtime/src/z_Linux_asm.S

        sed -i'' -e 's/__kmp_unnamed_critical_addr/___kmp_unnamed_critical_addr/g' runtime/src/z_Linux_asm.S

        mkdir -p build && cd build