advapi32: Add a stub for LsaGetUserName.

[Huang, Zhangrong]

I have one app needs to call LsaGetUserName, prototype for
LsaGetUserName pls see:
http://technet.microsoft.com/en-us/library/bb742447.aspx

ChangeLog:
    advapi32: Add a stub for LsaGetUserName.

-- 
$ apt-get moo
         (__)
         (oo)
   /------\/
  / |    ||
 *  /\---/\
    ~~   ~~
...."Have you mooed today?"...
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