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Do not continue autoprobing other protocols after socket error

Lauri Nurmi requested to merge lanurmi/fetchmail:no-autoprobe-after-socket-fail into legacy_64

If e.g. fetching with IMAP and --idle fails with a socket error, returning PS_SOCKET, do not try fetching with a different protocol (e.g. POP3).

POP3 might have a completely different idea of read and unread messages than IMAP, which causes already seen messages to be re-fetched.

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