[PATCH] user32/tests: Add optional messages to test sequences.

[Marvin]

Hi,

While running your changed tests, 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=85967

Your paranoid android.


=== w10pro64 (32 bit report) ===

user32:
msg.c:15780: Test failed: WaitForSingleObject returned ffffffff

=== w10pro64 (64 bit report) ===

user32:
msg.c:15780: Test failed: WaitForSingleObject returned ffffffff