disable SSL in libzip by default

[mattcieslak]

SSL isn't always available on build systems, and it's not used in TRX files at all. So we shouldn't enable it in libzip.

should help with ANTsX/ANTs#1963
closes tee-ar-ex/ITKTractographyTRX#29

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.64%. Comparing base (8690a7b) to head (1684e46).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #47   +/-   ##
=======================================
  Coverage   88.64%   88.64%           
=======================================
  Files          15       15           
  Lines        7749     7749           
  Branches     1043     1043           
=======================================
  Hits         6869     6869           
  Misses        880      880           

Flag	Coverage Δ
linux	87.83% <ø> (ø)
macos	88.47% <ø> (ø)

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