For anyone trying to apply the patch and wondering why make complains, it's because configure needs to be updated. (Or apply the attached patch, which manually adds the new directory in the two places it needs to be added.)
In the snippet + parent = new_richedit(NULL); + hwndRichEdit = new_richedit(parent); do you really want to embed a richedit box inside another richedit box? Wouldn't a plain window do for the outer window?
BTW I'm not sure winetest_interactive is supposed to enable infinite loops; you might want to add a 30 second timeout to your loop.
-- Wine for Windows ISVs: http://kegel.com/wine/isv