spec: add BR make

[fepitre]

QubesOS/qubes-issues#6982

[codecov]

Codecov Report

Merging #433 (3d73521) into master (d01be13) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #433   +/-   ##
=======================================
  Coverage   65.72%   65.72%           
=======================================
  Files          53       53           
  Lines        9894     9894           
=======================================
  Hits         6503     6503           
  Misses       3391     3391           

Flag	Coverage Δ
unittests	65.72% <ø> (ø)

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