[ros-kernel] A small ldr patch for cygwin

[art yerkes]

Using this patch, and forcing cygwin1.dll to use it's win95 personality, I can
load sh, get a prompt, and execute shell builtin commands.  Fork needs work
in ntoskrnl, which I talked about with David Welch a while back.  That stuff
will be a bit of work, but I think that several other programs use the same
feature cygwin does.

The change made here sets the lpvReserved argument to DllMain according to 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/dllmain.asp
and allows cygwin to figure out whether it was dynamically loaded by
LoadLibrary or by the system when starting a process.

Also, should I send the cygwin people a patch for forcing cygwin personality
using an env var?

If I don't hear anything negative, 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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