LookupAccountNameW() use ACCOUNT_SIDS domain and name_use fields for well known SIDs

[Paul Bryan Roberts]

LookupAccountNameW() has a stubbed but non-empty, incomplete, buggy 
implementation.  It fails a number of unit tests but Wine code relies on 
this.

This is the FOURTH of a series of NINE patches that provide what may be 
a reasonable first pass implementation of LookupAccountNameA() and 
LookupAccountNameW() that:

    - works for well known SIDs
    - works for 'first user account'
    - adds handling of 'first user account' to LookupAccountSid
    - passes existing units tests for LookupAccountName
    - corrects knock-on regression failures in the advapit32/security.c 
unit tests (there may be others elsewhere)
    - allows progress towards the resolution of Bug 14334

This patch replace the stub implementation with code that uses the 
ACCOUNT_SIDS domain and name_use fields.

This patch does not fix any units tests, nor does it break any.

Perhaps I should have added some but the only tests I could add would be 
to try all well-known-SIDS, which would have introduced a load more 
failing units tests and would have simply have been a distraction from 
the business at hand.

While this patch may not be obviously incorrect, it is not correct and 
is amended later when we have a unit test failure to correct.
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