[Dovecot] Build fix on HURD

[Marco Nenciarini]

I've made two little patches to allow dovecot to be compiled on GNU/Hurd.

Could you review them?

Kind regards,
Marco Nenciarini

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|    Marco Nenciarini    | Debian/GNU Linux Developer - Plug Member |
| mnencia at prato.linux.it | http://www.prato.linux.it/~mnencia       |
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