Add functions des_set_key_checked, des_set_key_unchecked.
Never use des_set_key (it depends on the global variable des_check_key), but usually des_set_key_unchecked. Only destest.c bothered to look at the return values of des_set_key, but it did not set des_check_key -- if it had done so, most checks would have failed because of wrong parity and because of weak keys.
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