uts: Allow for address space randomisation.
Randomise the base addresses of shared objects, non-fixed mappings, the
stack and the heap.  Introduce a service, svc:/system/process-security,
and a tool psecflags(1) to control and observe it

@@ -1,7 +1,8 @@
 nosys                   0
 rexit                   1
+psecflags               2
 read                    3
 write                   4
 open                    5
 close                   6
 linkat                  7