user32: Limit number of hooks called recursively.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=14749

Your paranoid android.


=== wvistau64 (64 bit msg) ===
msg.c:10595: Test failed: expected PeekMessage to return FALSE, got 1