Changeset 613ab62 in rtems

Patch from Dario Alcocer <alcocer@…> and Ralf Corsepius
<corsepiu@…> which attempts to detect when the UNIX port
is being configured on a system without System V IPC support. This
is an optional component on both FreeBSD and Linux systems. Most
Linux 2.x kernels ship with it enabled but it is still a real risk.

This test may have undesirable side-effects on some hosts. We will
address those conflicts as they arise.