Retrieves the name of the old IUP FONT names, given the native font. See the old Font Names table for a list of names.
char* IupUnMapFont(const char *driverfont); [in C] iup.UnMapFont(driverfont :string) -> (iupfont : string) [in Lua]
Returns: the name of the IUP font, given the native font. If such font does not exist, the function will return NULL.