libICE: Changes to 'master'

[Jon TURNEY]

Rebased ref, commits from common ancestor:
commit 8a511dad53774693ed818d54d7896e1663942b18
Author: Jon TURNEY <jon.turney at dronecode.org.uk>
Date:   Sat Sep 13 17:13:44 2014 +0100

    Include unistd.h for getpid()
    
    Signed-off-by: Jon TURNEY <jon.turney at dronecode.org.uk>
    Reviewed-by: David Macek <david.macek.0 at gmail.com>