internal/dirent: fix tests on s390x

[charlievieth]

This commit fixes tests on s390x (big-endian) by removing TestReadInt, which really only existed for code coverage.

Fixes #61

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.20%. Comparing base (c9ad02f) to head (c417919).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   59.20%   58.20%   -1.00%     
==========================================
  Files          12       12              
  Lines         804      804              
==========================================
- Hits          476      468       -8     
- Misses        314      322       +8     
  Partials       14       14              

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[QuLogic]

This is good on all arches I can try: https://koji.fedoraproject.org/koji/taskinfo?taskID=136855758

[charlievieth]

@QuLogic Thank you again for testing this and do you need for me to cut a new release that includes this change?

[QuLogic]

It wasn't strictly necessary, but thanks for the new release all the same!