[Exim] [PATCH] exim-4.04 support non-HASH db files

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Well, I found the problem I was having doing a db lookup into a Cyrus IMAPD
mailboxes.db file... Cyrus uses BTREE-style files, and Exim uses only
HASH-style files, and assumes that's all you'd ever want to look into.

The attached patch modifies the behavior of exim-4.04 (only for when db3 is
in use) to allow the file to be any format if it's being opened in read-only
mode, but specify DB_HASH if it's not (like when exim is actually creating a
new db file). This works great for me, exim has no trouble reading
previously created exim db files, but now can also read Cyrus db files.
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[ exim-dblookup-patch of type application/octet-stream deleted ]
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