kernel32/tests: Add test for process object destruction.

[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=19056

Your paranoid android.


=== wvistau64 (32 bit process) ===
process.c:2791: Test failed: WaitForSingleObject returned 258

=== wvistau64 (64 bit process) ===
prporocess: process1 tests executed (0 marked .c:2791: Test failed: Waias todotForSingleObject ret, 0 failures), 0urned 258