Provide a fallback implementation for all the functions to avoid
having to check for NULL functions everywhere.

headers.

  NtQueryInformationToken.
- Implement TokenUser for NtQueryInformationToken.
- Add a function for getting the user's registry path from a SID.

Troy Rollo).

user32 load time.

- Make tests pass under Wine.

LsaCallAuthenticationPackage, LsaConnectUntrusted and
LsaDeregisterLogonProcess.

send and endscene is called to make sure that the correct surface is
updated.

code in SystemParametersInfoW.

setting).