Fix BSD loading on 32bits

[gpotter2]

• fixes OpenBSD 32-bit, ifaces not populated #4626 and add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.33%. Comparing base (ef6da4b) to head (2f580fa).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4669      +/-   ##
==========================================
- Coverage   82.11%   81.33%   -0.79%     
==========================================
  Files         359      359              
  Lines       86576    86576              
==========================================
- Hits        71096    70415     -681     
- Misses      15480    16161     +681     

Files with missing lines	Coverage Δ
scapy/arch/bpf/pfroute.py	78.31% <100.00%> (-14.16%)	⬇️

... and 30 files with indirect coverage changes

[sthen]

Many thanks, confirmed this fixes 32-bit and does not break 64-bit.

[gpotter2]

You're welcome @sthen. Btw I tested sending on the loopback after seeing openbsd/src@473ed62, it seems to work just fine on 2.6.1 (but could indeed have been broken on 2.4.5).