Add preprocessor flag to unit test for importlib.metadata.

[anirbanr-fb-r2p]

Summary: Add preprocessor flag to unit test for importlib.metadata; the latter was introduced in python3.8.

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[codecov]

Codecov Report

Merging #154 (eb61aad) into main (5562304) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage   89.06%   89.06%           
=======================================
  Files          67       67           
  Lines        3888     3888           
=======================================
  Hits         3463     3463           
  Misses        425      425           

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[PaliC]

lgtm

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