rem: void icalproperty_set_x_name(icalproperty* prop, char* name)
add: void icalproperty_set_x_name(icalproperty* prop, const char* name)
context: void icalproperty_set_x_name(icalproperty* prop, char* name){    struct icalproperty_impl *impl = (struct icalproperty_impl*)prop;    icalerror_check_arg_rv( (name!=0),"name");    icalerror_check_arg_rv( (prop!=0),"prop");    if (impl->x_name != 0) {        free(impl->x_name);    }    impl->x_name = icalmemory_strdup(name);    if(impl->x_name == 0){	icalerror_set_errno(ICAL_NEWFAILED_ERROR);    }}