Fix fakenect not handling freenect_process_events_timeout

There was no equivalent to freenect_process_events_timeout (core.c) in
fakenect.c. The supplied fix might be crude, but it's better than fakenect
not working at all.

Signed-off-by: Jonas Deitmerg <jonasdeitmerg@aim.com>
Merge pull request #389 from mowfask/signed-master

fakenect: Add implementation for freenect_process_events_timeout

Reviewed-by: Benn Snyder <benn.snyder@gmail.com>