[PATCHES] fix build on GNU/Hurd with GCC 4.8

[Pino Toscano]

Hi,

(please CC me, as I am not subscribed)

with GCC 4.8, few "implicit declaration of function" warnings become 
errors, breaking the build of xserver on the Hurd.

Attached there are two patches, which apply fine in both master and 
server-1.14-branch branches, which fix the errors providing the right 
includes:
* the inclusion of <hurd.h> in Hurd parts should be straightforward
* the move of the <arpa/inet.h> (which is POSIX) to a move general
  location affects any other Unix system with IPv6 support, I hope it is
  not a problem for all the supported platforms

Thanks,
-- 
Pino Toscano
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