[NtQuerySystemInformation #1] Fixes + tests for SystemBasicInformation

[Paul Vriens]

Hi,

first patch, more to come, but I need some input whether I'm following
the right route. So comments/suggestions/remarks are welcomed.

This patch deals with some general fixes for NtQuerySystemInformation
and the start of unit tests.

Next patches will add unit tests and fixes for the Wine part of things.
I've also seen that we have 53 different classes. WinXP and W2K3 have
upto 73, but of course all undocumented. And within those 73 several are
not implemented ! 

Changelog
  Start of unit tests for *Info* functions
  Check needed length regardless of given length
  Return STATUS_INVALID_INFO_CLASS for non-implemented classes
  Return STATUS_ACCESS_VIOLATION if no buffer given

Cheers,

Paul Vriens
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