fetchmail: Update to version 6.4.39

fetchmail: Update to version 6.4.39

- Update from version 6.4.38 to 6.4.39
- Update of rootfile not required
- Changelog
    6.4.39
	# BUG FIXES:
		* When a server offers STARTTLS although the connection is already wrapped
		  in TLS, fetchmail would issue a bogus "WARNING: server offered STARTTLS
		  but sslproto '' given." (or STLS for POP3).  In situations where we wrap
		  the connection in TLS, suppress the warning. Reported by Mike Pope.
		* If fetchmail was running localized, generate an error e-mail message
		  locally, and if the selected translation would require the Subject: line
		  to wrap inside an RFC-2047 encoded word (=?UTF-8?Q?...?=), the wrapped
		  encoded-word was not indented, thus not marked as a continuation line.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>