message: Fix LLVM detection
diff: @@ -65,12 +65,13 @@ jobs:
  7z x llvm-installer.exe -oC:/llvm-10
  echo ::add-path::C:/llvm-10/bin
  echo ::set-env name=LLVM_SYS_100_PREFIX::C:/llvm-10
  + echo ::set-env name=LIBCLANG_PATH::C:/llvm-10/bin/libclang.dll
  - name: Install LLVM (macOS)
  if: matrix.os == 'macos-latest'
  run: |
  curl https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/clang+llvm-10.0.0-x86_64-apple-darwin.tar.xz -L -o llvm.tar.xz
  mkdir -p /opt/llvm-10
  - tar xf llvm.tar.xz -C /opt/llvm-10
  + tar xf llvm.tar.xz --strip-components=1 -C /opt/llvm-10
  echo ::add-path::/opt/llvm-10/bin
  echo ::set-env name=LLVM_SYS_100_PREFIX::/opt/llvm-10
  - name: Install LLVM (Linux)
  @@ -78,7 +79,7 @@ jobs:
  run: |
  curl https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04.tar.xz -L -o llvm.tar.xz
  mkdir -p /opt/llvm-10
  - tar xf llvm.tar.xz -C /opt/llvm-10
  + tar xf llvm.tar.xz --strip-components=1 -C /opt/llvm-10
  echo ::add-path::/opt/llvm-10/bin
  echo ::set-env name=LLVM_SYS_100_PREFIX::/opt/llvm-10
  - name: Set up dependencies for Mac OS
  