kernel32/tests: Remove check of environment variables against registry

[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
http://testbot.winehq.org/JobDetails.pl?Key=7738

Your paranoid android.


=== W7PROX64 (64 bit environ) ===
TestLauncher.c:200: Test failed: Can't locate import module name in C:\winetest\kernel32_test64.exe