[Dovecot] Patch for zlib and maildir for 1.0.13

[Richard Platel]

When using the zlib plugin with maildir and copying with hardlinks,  
if a compressed message is copied, the 'Z' suffix on the file isn't  
copied, so the new message isn't uncompressed when it's fetched.

I wasn't smart enough to figure out a clean way to carry a file  
suffix through a copy, so I changed how the zlib-plugin detects if a  
message is compressed.  This patch peeks at the first two bytes of  
the message looking for the zlib header.

--
Richard Platel
Tucows
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