ntdll / kernel32: #53

[Eric Pouech]

This patch starts looking at providing full overlapped I/O support to named 
pipes. We're not here yet.
It basically starts making the wineserver side of the named pipe code:
- use NT values instead of kernel32
- make use of asynchronous I/O
The rest of the patch is mainly cleanup. It should be a no op change.

A+
-- 
Eric Pouech