[Dovecot] vpopmail support on 64 bits

[aledr]

Good day!

Compiling 1.1.11 with vpopmail flag on a 64bit system drop me these
warnings that breaks it portability:

passdb-vpopmail.c: In function 'vpopmail_lookup_credentials':
passdb-vpopmail.c:71: warning: pointer targets in passing argument 2
of 'callback' differ in signedness
passdb-vpopmail.c: In function 'vpopmail_preinit':
passdb-vpopmail.c:141: warning: implicit declaration of function
'auth_cache_parse_key'
passdb-vpopmail.c:142: warning: assignment makes pointer from integer
without a cast

Thanks.
--
[ ]'s
Aledr - Alexandre
"OpenSource Solutions for SmallBusiness Problems"