change_flag
change_flag(edit_flags[ele], OF_SPECIAL, 1);
change_flag(FPOSIX, OF_SPECIAL, 1);
change_flag(FEMACS, OF_SPECIAL, 1);
change_flag((enum sh_flag) i, what, set);
change_flag((enum sh_flag) ele, what,
void change_flag(enum sh_flag, int, int);
change_flag(FPOSIX, OF_SPECIAL, 1);