widl: Pass the switchtype attribute from an alias to the base type

[Alexandre Julliard]

Eric Kohl <eric.kohl at t-online.de> writes:

> Hi,
>
> this patch ensures that client and server code for non-encapsulated
> unions is generated correctly. The switchtype attribute must be passed
> to from a type alias to the base type in order to get recognized by
> write_union_tfs().

Modifying the base type doesn't seem right. You should add some test
cases.

-- 
Alexandre Julliard
julliard at winehq.org