user32/tests: Add tests for MsgWaitForMultipleObjectsEx.

[Sebastian Lackner]

Shows that MsgWaitForMultipleObjectsEx is working correctly, and only CoWaitForMultipleHandles suffers from bug 32568 (should prefer APC calls over window messages).

Test failures on w7u and w8 are also present with a noop patch:
http://newtestbot.winehq.org/JobDetails.pl?Key=10052

---
 dlls/user32/tests/msg.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
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