Fix PR 44075 from Peter Pentchev, but do this by adding a
--numtries=<attempts> option to netpgp(1) to provide the maximum
number of attempts to retrieve the correct passphrase when signing or
decrypting, and use it in libnetpgp(3). The default number of
attempts is 3, and a value of "unlimited" will loop until the correct
passphrase has been entered.