user32: Adds test to check if the corresponding atom is released after calling UnregisterClass().

[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=45027

Your paranoid android.

=== build (build log) ===

../../../../wine/include/wine/test.h:122:83: error: too few arguments to function ‘winetest_ok’
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected ‘;’ before ‘)’ token
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected statement before ‘)’ token
Makefile:219: recipe for target 'class.o' failed
Makefile:7500: recipe for target 'dlls/user32/tests' failed
Task: The exe32 Wine crossbuild failed

=== debian9 (build log) ===

../../../../wine/include/wine/test.h:122:83: error: too few arguments to function ‘winetest_ok’
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected ‘;’ before ‘)’ token
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected statement before ‘)’ token
Makefile:219: recipe for target 'class.o' failed
Makefile:8635: recipe for target 'dlls/user32/tests' failed
Task: The win32 build failed

=== debian9 (build log) ===

../../../../wine/include/wine/test.h:122:83: error: too few arguments to function ‘winetest_ok’
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected ‘;’ before ‘)’ token
../../../../wine/dlls/user32/tests/class.c:235:65: error: expected statement before ‘)’ token
Makefile:219: recipe for target 'class.o' failed
Makefile:8360: recipe for target 'dlls/user32/tests' failed
Task: The wow64 build failed