Fix the conduit_server_manual example

This now builds with the current mirage-xen dev packages.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Fix conduit_server_manual example for both Unix and Xen

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #55 from djs55/fix-build

Fix the conduit_server_manual example