cmake HAVE_CMATH_ISINF examples

KiCad/kicad-source-mirror cmake/PerformFeatureChecks.cmake :99

check_cxx_source_compiles( "#include <cmath>\nint main(int argc, char** argv)\n{\n  (void)argv;\n  std::isinf(1.0);  (void)argc;\n  return 0;\n}\n"  HAVE_CMATH_ISINF )