cmake _HAVE_FLOOR_2 examples

asset-group/5ghoul-5g-nr-attacks libs/react-cpp/libev/CMakeLists.txt :105 

check_symbol_exists(floor math.h _HAVE_FLOOR_2)

asset-group/5ghoul-5g-nr-attacks libs/react-cpp/libev/CMakeLists.txt :110 

unset(_HAVE_FLOOR_2)