allow read into untouched noreserve mappings

[Brian Ford]

On Mon, 17 Jul 2006, Brian Ford wrote:
> Untested this time because I have to run to an appointment.

Now tested and working fine with no changes.

I guess I can infer from cgf's mail to cygwin-developers that this will
not make it into 1.5.21 :-(.

-- 
Brian Ford
Lead Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained crew...