user32: Add BM_SETSTATE/BM_SETCHECK message tests for a button, make them pass under Wine.

[Greg Geldorp]

> From: Dmitry Timoshkov [mailto:dmitry at codeweavers.com]
>
> That's not a failure in the new test, according the W7PROX64 log button
> message tests pass without any problem, the test just timeouts at the end.
> This seems to be not related to the new tests.

Agreed. I ran the msg test without your changes (job 1649) and it shows the
same timeout. Funny thing is it doesn't time out when the test is being
launched from winetest-latest.exe (job 1635). I'll see if I can track down
what's going on here.

Ge.