msi: Implement handling for the ErrorDialog and use it to change media

[Alexandre Julliard]

"James Hawkins" <truiken at gmail.com> writes:

> This fixes bug 3236.  http://bugs.winehq.org/show_bug.cgi?id=3236
>
> Changelog:
> * Implement handling for the ErrorDialog and use it to change media.

This displays a message box when running the install.c test, which
will prevent the tests from running unattended.

-- 
Alexandre Julliard
julliard at winehq.org