ensure the conformance/variance calculation function can find the
necessary fields in the structures.

that caused string_of_type to fail and the RPC_FC_BIND_PRIMITIVE code
not to be executed.

widl: A structure with variance, but without conformance should be a complex struct instead of a conformant, varying struct.

Confirmed by the original author and the major contributors.

Do this by changing references from other interfaces (and possibly other 
typelibs) to uniquely identify them.

Add special handling to GetRefTypeInfo to cope with this.

The Attribute field of the CREDENTIALA/W structs should instead be 
Attributes.

oleaut32: For automatic-value-getting in ITypeInfo::Invoke, it doesn't matter what flag(s) the function was executed with, just what type of function is being invoked.

server: Move most of the duplicate_token request to a new function, token_duplicate, to enable the code to be used inside wineserver.