cmake HAVE_CLANG_PLUGIN_SUPPORT examples

Lewuathe/mlir-hello thirdparty/llvm-project/clang/CMakeLists.txt :424

CMAKE_DEPENDENT_OPTION(CLANG_PLUGIN_SUPPORT
  "Build clang with plugin support" ON
  "HAVE_CLANG_PLUGIN_SUPPORT" OFF)

root-project/root interpreter/llvm-project/clang/CMakeLists.txt :423

CMAKE_DEPENDENT_OPTION(CLANG_PLUGIN_SUPPORT
  "Build clang with plugin support" ON
  "HAVE_CLANG_PLUGIN_SUPPORT" OFF)