Solve some build issues for EL8 and Postgis < 3.4

[pgguru]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.89%. Comparing base (d03dd92) to head (8b28578).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   90.88%   90.89%           
=======================================
  Files          92       92           
  Lines       10424    10431    +7     
=======================================
+ Hits         9474     9481    +7     
  Misses        950      950           

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