only autoinclude files ending with .jl in macros

[hexaeder]

possible fix for #3746

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.38%. Comparing base (71c7764) to head (ff85110).

❗ Current head ff85110 differs from pull request most recent head e9d85e9

Please upload reports for the commit e9d85e9 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3747   +/-   ##
=======================================
  Coverage   98.38%   98.38%           
=======================================
  Files          44       44           
  Lines        5866     5867    +1     
=======================================
+ Hits         5771     5772    +1     
  Misses         95       95           

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[odow]

Thanks. I made a slight change and added a comment.