Advapi regression fix

[Hannu Valtonen]

Hello,

This fixes a regression (eMule would crash on startup) in advapi with 
latest CVS. It also simplifies GetUserNameW by a few lines.

License: LGPL

Changelog: Pass the lpSize arg correctly to GetUserNameW

- Hannu Valtonen
Hannu.Valtonen at hut.fi

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