riched20: add stub ITextDocument

[Alexandre Julliard]

Stefan Dösinger <stefandoesinger at gmx.at> writes:

> If I read the macros correctly they are for defining COM interfaces and casts 
> from implementation pointer to interface pointer. DDraw has a couple of 
> macros for that in dlls/ddraw/ddcomimpl.h, perhaps we should move this file 
> to include/wine/?

No, like I said we should avoid that sort of thing. Inline functions
are much preferable. Look at dlls/shell32/shelllink.c for an example.

-- 
Alexandre Julliard
julliard at winehq.org