server: Fix generic access mapping for a thread.

[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=4597

Your paranoid android.


=== wvista (32 bit security) ===
security.c:4990: Test failed: 4: expected 0x1f03ff, got 0x1fffff

=== w2008s64 (32 bit security) ===
security.c:4990: Test failed: 4: expected 0x1f03ff, got 0x1fffff

=== w7pro64 (32 bit security) ===
security.c:4990: Test failed: 4: expected 0x1f03ff, got 0x1fffff

=== w2008s64 (64 bit security) ===
security.c:4990: Test failed: 4: expected 0x1f03ff, got 0x1fffff

=== w7pro64 (64 bit security) ===
security.c:4990: Test failed: 4: expected 0x1f03ff, got 0x1fffff