Fix with -Wstrict-prototypes

[paleolimbot]

Fixes #157.

[codecov-commenter]

Codecov Report

Base: 99.04% // Head: 99.04% // No change to project coverage 👍

Coverage data is based on head (2560e26) compared to base (c43644c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #158   +/-   ##
=======================================
  Coverage   99.04%   99.04%           
=======================================
  Files          81       81           
  Lines        5875     5875           
=======================================
  Hits         5819     5819           
  Misses         56       56           

Impacted Files	Coverage Δ
src/init.c	100.00% <ø> (ø)
inst/include/wk-v1-impl.c	93.13% <100.00%> (ø)
src/bbox-handler.c	100.00% <100.00%> (ø)
src/count-handler.c	100.00% <100.00%> (ø)
src/meta-handler.c	100.00% <100.00%> (ø)
src/problems-handler.c	76.19% <100.00%> (ø)
src/sfc-writer.c	98.88% <100.00%> (ø)
src/void-handler.c	100.00% <100.00%> (ø)
src/wkb-writer.c	100.00% <100.00%> (ø)
src/xy-writer.c	100.00% <100.00%> (ø)

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