[Dovecot] dovecot-metadata-plugin v14 patches

[Sergey Sidlyarenko]

Please apply patches for dovecot-metadata-plugin v14.
1. dovecot-metadata-plugin-value_nil - fix plugin crach if entry->value 
== NULL (strlen(NULL) - segfault).
2. dovecot-metadata-plugin-utf7_support - add support metadata for UTF8 
mailfolder.

-- 
Sidlyarenko Sergey
https://github.com/lefoyer
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