user32/tests: Use if(0) instead of a comment to make sure code still compiles

[testbot at testbot.winehq.org]

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
http://testbot.winehq.org/JobDetails.pl?Key=3023

Your paranoid android.


=== W7PRO (32 bit msg) ===
msg.c:9516: Test failed: wrong qstatus 00110011
msg.c:9523: Test failed: wrong qstatus 00190008
msg.c:9529: Test failed: wrong qstatus 00390020
msg.c:9538: Test failed: wrong qstatus 00790040
msg.c:9559: Test failed: wrong qstatus 00390000
msg.c:9567: Test failed: wrong qstatus 00790040
msg.c:9578: Test failed: wrong qstatus 00390000
msg.c:9589: Test failed: wrong qstatus 00310000
msg.c:9594: Test failed: PeekMessageA should have returned FALSE instead of msg 0113

=== W7PROX64 (64 bit msg) ===
Timeout