wintrust/tests: Compile with -D__WINESRC__

[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://newtestbot.winehq.org/JobDetails.pl?Key=2850

Your paranoid android.


=== w864 (32 bit crypt) ===
crypt.c:289: Test failed: Expected success, got FALSE with 87
crypt.c:293: Test failed: Expected success, got FALSE with 87