Small RPC Bug Fixes

[Robert Shearman]

Changelog:
- Don't pass the PROFILE_SERVER flag in to CreateNamedPipe as it is bogus.
- Call FlushFileBuffers to make sure the other end of the pipe doesn't 
get cut off prematurely.
- Don't call CancelIo as we should never have async I/O pending.

-- 
Rob Shearman

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