setup_override_dir.jl: allow passing args to configure

[fingolfin]

Also use that to treat warnings as error in some CI tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.55%. Comparing base (5cbad84) to head (f5a40ea).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1060      +/-   ##
==========================================
+ Coverage   75.04%   75.55%   +0.50%     
==========================================
  Files          55       55              
  Lines        4556     4671     +115     
==========================================
+ Hits         3419     3529     +110     
- Misses       1137     1142       +5     

see 3 files with indirect coverage changes

[lgoettgens]

seems reasonable

[lgoettgens]

The failures:

• julia nightly, GAP master: will be fixed by Put jl_gc_new_weakref in a header file again JuliaLang/julia#56319
• julia nightly, GAP stable-4.13: will be fixed by Put jl_gc_new_weakref in a header file again JuliaLang/julia#56319
• julia 1.6, GAP stable-4.13: already fixed on master by https://github.com/gap-system/gap/pull/5827/files#diff-eb82a6c52d1abf8ebff5539bde20ed837fd36fc0ff1bf7d7f32c023cc4ab2a4a, but will need a backport to make CI green here (or a gap 4.14 release and change of CI-relevant branches)