Update build_hardware.md

[Gizmo1k]

fix roll your own link

[codecov-io]

Codecov Report

Merging #547 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #547   +/-   ##
=======================================
  Coverage   37.21%   37.21%           
=======================================
  Files          30       30           
  Lines        5554     5554           
  Branches      634      634           
=======================================
  Hits         2067     2067           
  Misses       3339     3339           
  Partials      148      148

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