experimental DNS fingerprint

[Roumen Petrov]

Please find attached file "configure.ac+dns.patch".
This patch allow to compile current (30 Jun 2003) with options 
--with-dns on my platform.

Output from "ssh -v -o VerifyHostKeyDNS=yes ..." follow:
...
debug1: found 1 fingerprints in DNS
debug1: matching host key fingerprint found in DNS
...

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