feat(os): add os_strncmp definition

[aloisklink]

Source-code taken from the hostap project expects a os_strncmp call that points to strncmp.

---

Adapted from commit https://github.com/nqminds/edgesec/commits/12d15b2405aa6f2ab39a31d880499f8fc6f84c02, which instead names this macro sys_strncmp.

edgesec/src/utils/os.h

Lines 67 to 69 in 12d15b2

	#ifndef sys_strncmp
	#define sys_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
	#endif

Using os_strncmp is a lot easier, since then we can avoid changing any of the hostap code.

[codecov]

Codecov Report

Merging #430 (b0e1aee) into main (ba237fd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #430   +/-   ##
=======================================
  Coverage   53.09%   53.09%           
=======================================
  Files         144      144           
  Lines       19880    19880           
=======================================
  Hits        10555    10555           
  Misses       9325     9325           

Impacted Files	Coverage Δ
src/utils/os.h	100.00% <ø> (ø)

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