dinput: Add IID_IUnknown to DICF_CreateInstance(), DirectInputCreateEx()

[Jim Cameron]

DICF_CreateInstance() and DirectInputCreateEx() refuse
to create an object if asked for an IUnknown interface
to it, although the object itself must, and does,
implement IUnknown. This causes an exception at
startup in Evolva. This patch adds IID_IUnknown to the
list of IIDs accepted by these functions.

jim
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