[Dovecot] Sieve plugin should recompile when symbolic link changes [patch]

[Frank Behrens]

The sieve plugin compares the modification dates of sieve source and compiled script and 
compiles the script only if necessary. When the managesieve extension is used, it creates a 
symbolic link for the script. In order to switch between scripts managesieve changes the link 
only.

Therefore the sieve plugin should include the modification date of an symlink in its decision 
about compilation. The attached patch adds this functionality.

Regards,
   Frank
-- 
Frank Behrens, Osterwieck, Germany
PGP-key 0x5B7C47ED on public servers available.

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