fix: Fix deprecation warnings

[Antonov548]

• fix compilation warnings from logs. Warning is -Wstrict-prototypes
  • remove extern for function - deprecated
  • fix arguments for prototypes. void for prototypes without arguments.

[codecov-commenter]

Codecov Report

Base: 63.44% // Head: 63.44% // No change to project coverage 👍

Coverage data is based on head (0bd333d) compared to base (d907ccf).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   63.44%   63.44%           
=======================================
  Files          13       13           
  Lines         279      279           
=======================================
  Hits          177      177           
  Misses        102      102           

Impacted Files	Coverage Δ
src/init.c	100.00% <ø> (ø)
src/trace_back_backtrace.c	9.80% <0.00%> (ø)
src/trace_back_unwind.c	97.43% <ø> (ø)
src/trace_back.c	58.33% <100.00%> (ø)

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[krlmlr]

Thanks!