cmake JSON_HAS_CPP_ examples

cs1ime/ceserver-rawmem thirdparty/nlohmann_json/cmake/test.cmake :236 

string(FIND "${file_content}" JSON_HAS_CPP_${cxx_standard} has_cpp_found)

OpenMS/OpenMS src/openms/extern/nlohmann_json/cmake/test.cmake :236 

string(FIND "${file_content}" JSON_HAS_CPP_${cxx_standard} has_cpp_found)