rpcrt4: Give a proper name to some formerly reserved MIDL_STUB_MESSAGE fields.

[Francois Gouget]

On Wed, 10 Jan 2007, Francois Gouget wrote:

> Define NTDDI_WIN2K so we get definitions for the Reserved51_X fields with the PSDK.
> This fixes compilation of the ndr_marshall.c with the PSDK.

Ignore this one for now, it does not really solve the compilation 
problems with the PSDK so I will rework it a bit.

-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
  Good judgment comes from experience, and experience comes from bad judgment
                               -- Barry LePatner