oleaut32: preliminary support for VT_DISPATCH as parameters to VarAdd (and other 2-operand operations) (try 3)

[a_villacis at palosanto.com]

This is another attempt to add IDispatch support to several 2-operand
functions. Now the macro was removed and the VT_DISPATCH handling was
copied to every affected function.

Changelog:
* Add IDispatch handling to several 2-argument functions
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