Fix the WebAssembly build

[jerbob92]

Accidentally a import "C" was added to the WebAssembly implementation. When you then have no CGO available in your environment, the build fails. I have also added some extra steps to catch this in the CI process next time.

Fixes #169

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.14%. Comparing base (17f2263) to head (e5db754).
Report is 2 commits behind head on main.

❗ Current head e5db754 differs from pull request most recent head d8ff969

Please upload reports for the commit d8ff969 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   78.14%   78.14%           
=======================================
  Files         110      110           
  Lines       18942    18942           
=======================================
  Hits        14803    14803           
  Misses       2358     2358           
  Partials     1781     1781           

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