Don't eagerly initialize `libcurl`

[staticfloat]

This initialization will be done by an on_load_hook within libcurl_jll, once https://github.com/JuliaLang/julia/pull/50687 is merged.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.74%. Comparing base (05f9ec2) to head (421a744).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
+ Coverage   89.70%   89.74%   +0.03%     
==========================================
  Files           5        5              
  Lines         583      585       +2     
==========================================
+ Hits          523      525       +2     
  Misses         60       60              

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