kernel32: Implement K32GetProcessImageFileNameA().

[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=13315

Your paranoid android.


=== WVISTAADM (32 bit psapi_main) ===
psapi_main.c:110: Test failed: cbNeeded=100

=== W2K8SE (32 bit psapi_main) ===
psapi_main.c:110: Test failed: cbNeeded=100

=== W7PRO (32 bit psapi_main) ===
psapi_main.c:110: Test failed: cbNeeded=96

=== W7PROX64 (32 bit psapi_main) ===
psapi_main.c:110: Test failed: cbNeeded=108