Fix conf.route.route() on linux

[gpotter2]

fixes #4730

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.16%. Comparing base (15c632d) to head (a10090f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4753   +/-   ##
=======================================
  Coverage   82.16%   82.16%           
=======================================
  Files         362      362           
  Lines       87345    87345           
=======================================
  Hits        71763    71763           
  Misses      15582    15582           

Files with missing lines	Coverage Δ
scapy/route.py	90.37% <100.00%> (ø)

... and 2 files with indirect coverage changes

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