rpc: (resend) Add missing headers

[Roy Shea]

Hello,

Attached is a corrected version of this patch.  I thank Mikolaj who
brought to my attention the fact that rpcproxy.h is the incorrect
location to include the files I added in the earlier patch.

This revised patch adds the includes directly to rpc.h.  The Windows
version of rpc.h accesses these includes throuh windows.h.

Peace,
-Roy

On Tue, Oct 23, 2007 at 09:50:25AM -0700, Roy Shea wrote:
> Howdy,
>
> The REGISTER_PROXY_DLL_ROUTINES macro defined in rpcproxy.h calls
> DisableThreadLibraryCalls.  This patch adds two header files needed
> for calls to DisableThreadLibraryCalls.
>
> Peace,
> -Roy