bug#57373: 28.1; authinfo keyword smtp-auth does not work

[Robert Pluim]

>>>>> On Wed, 24 Aug 2022 13:46:15 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> +                          process (intern-soft (pop mechs)) user 
password))))

    Lars> Is there any reason to not just use `intern' here?

`mechs' can be either the intersection of `smtpmail-auth-supported'
 and `supported-extensions' or the result from `auth-info'. In the
 latter case it contains strings, in the former symbols, and `intern'
 only accepts symbols.

Robert
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