Fixed local ip lookup on macOS GitHub instances.

[nmoinvaz]

macOS GitHub instances were previously failing.
https://github.com/nmoinvaz/proxyres/actions/runs/7175594794/job/19539143942

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (8d75d9c) 55.68% compared to head (d53c2e7) 47.57%.

Files	Patch %	Lines
net_util.c	33.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   55.68%   47.57%   -8.12%     
==========================================
  Files          53       53              
  Lines        4606     4599       -7     
  Branches     1062     1059       -3     
==========================================
- Hits         2565     2188     -377     
- Misses       1368     1784     +416     
+ Partials      673      627      -46     

Flag	Coverage Δ
macos	45.47% <66.66%> (+0.01%)	⬆️
ubuntu	40.97% <66.66%> (-12.45%)	⬇️
ubuntu_curl	41.33% <66.66%> (-11.75%)	⬇️
windows	52.98% <66.66%> (-3.68%)	⬇️

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