advapi32: Implement GetSecurityInfo. [take 3]

[Dan Hipschman]

On Thu, Aug 07, 2008 at 02:33:35PM -0700, Juan Lang wrote:
> > I guess I should elaborate on that.  You can request any of the four
> > parts of the security descriptor and pass NULL for the SD itself and
> > Windows will return them without anyway to free the memory.
> 
> I can see what MSDN says it does, but your tests don't check that
> calling GetSecurityInfo with a non-null ppsidOwner, ppsidGroup etc.
> and a null ppSecurityDescriptor is allowed.  Because you're not
> checking it, it looks like a bug.

These results were determined through tests that I ran on Windows.  I
don't think I included them with the conformance tests because I didn't
think tests that leaked memory would be very good tests.  I will send
them in a separate patch since the implementation is still valid.