Fix overview issues on OpenBSD

[Julien-Elie]

Failed Set                 Fail/Total (%) Skip Stat  Failing Tests
-------------------------- -------------- ---- ----  ------------------------
overview/api                  3/69     4%    6    0  18, 21-22
overview/xref                 2/37     5%    0    0  35-36

not ok 18
#  left: 7499
# right: 7498
not ok 21
not ok 22

tradspool: mapping file spool/tradspool.map not found
ok 34
not ok 35
not ok 36

This seems worth further investigation (maybe a real bug, and not an issue in the test suite itself).

• overview/api is more tradindexed failures
• overview/xref seems like article canceling is not working properly on OpenBSD (we're getting back a valid token for an article in groups where it should be canceled)

(Russ' analysis)

[Julien-Elie]

The first point for the overview/api test is now fixed. Only the second one for overview/xref remains.