[ros-kernel] DuplicateHandle on GetCurrentProcess

[art yerkes]

In order to fork, cygwin needs to DuplicateHandle on a process handle, which
starts out as the current process handle.  This change allows a process handle,
or the special GetCurrentProcess result to be duplicated.  I forked the
implementation of DuplicateHandle because the PEPROCESS that is the result of
ObDereferenceObjectByHandle is a different type from the objects expected in
NtDuplicateObject.

Again, if there's no negative feedback, I'll commit in a couple of days.
-- 
"Should array indices start at 0 or 1? My compromise of 0.5 was rejected
 without, I thought, proper consideration."
   - S. Kelly-Bootle
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