IPinImpl_QueryInternalConnections() is unused

[Francois Gouget]

dlls/qcap/pin.c defines an IPinImpl_QueryInternalConnections() function 
but it is not actually used anywhere. Is there any reason to keep it?

It sort of looks like IPin is a virtual class and that 
IPin::QueryInternalConnections() is going to be implemented in its 
descendents like VfwPin as is currently the case. But then 
VfwPin_QueryInternalConnections() is just as much of a stub so maybe it 
is it that should go away?