refactor: remove #include <linux/if_link.h>

[aloisklink]

This include seems to do nothing, except make it difficult to compile edgesec on a non-Linux OS.

[codecov]

Codecov Report

Merging #247 (ff3ec9a) into main (86b5e8c) will decrease coverage by 2.90%.
The diff coverage is n/a.

❗ Current head ff3ec9a differs from pull request most recent head 4b7e99e. Consider uploading reports for the commit 4b7e99e to get more accurate results

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
- Coverage   48.51%   45.61%   -2.91%     
==========================================
  Files         113      107       -6     
  Lines       17887    14951    -2936     
==========================================
- Hits         8678     6820    -1858     
+ Misses       9209     8131    -1078     

Impacted Files	Coverage Δ
src/utils/iface.c	18.18% <ø> (-2.36%)	⬇️
src/utils/net.c	66.99% <0.00%> (-11.08%)	⬇️
src/utils/nl.c	1.18% <0.00%> (-9.54%)	⬇️
src/ap/hostapd.c	68.57% <0.00%> (-7.01%)	⬇️
src/utils/os.c	40.00% <0.00%> (-5.30%)	⬇️
src/utils/allocs.h	75.00% <0.00%> (-5.00%)	⬇️
tests/radius/ip_addr.c	75.00% <0.00%> (-5.00%)	⬇️
src/dhcp/dhcp_service.c	64.28% <0.00%> (-4.47%)	⬇️
src/dns/mdns_list.c	71.15% <0.00%> (-3.85%)	⬇️
src/dns/command_mapper.c	70.58% <0.00%> (-3.10%)	⬇️
... and 94 more

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