Add trailing slash to compile make target

[eapolinario]

Tracking issue

Closes #4639

Why are the changes needed?

Minor fix. I couldn't find anything about the guarantees for the bin directory, so adding a bit of defensive programming.

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (81ce71e) 58.11% compared to head (a1394e1) 58.11%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4648   +/-   ##
=======================================
  Coverage   58.11%   58.11%           
=======================================
  Files         626      626           
  Lines       53815    53815           
=======================================
  Hits        31277    31277           
  Misses      20036    20036           
  Partials     2502     2502           

Flag	Coverage Δ
unittests	58.11% <ø> (ø)

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