cmake HAVE_CORESERVICES examples

Lewuathe/mlir-hello thirdparty/llvm-project/clang/lib/DirectoryWatcher/CMakeLists.txt :9 

check_include_files("CoreServices/CoreServices.h" HAVE_CORESERVICES)

root-project/root interpreter/llvm-project/clang/lib/DirectoryWatcher/CMakeLists.txt :9 

check_include_files("CoreServices/CoreServices.h" HAVE_CORESERVICES)

o2e/OLLVM-9.0.1 tools/clang/lib/DirectoryWatcher/CMakeLists.txt :9 

check_include_files("CoreServices/CoreServices.h" HAVE_CORESERVICES)