fix for crash when libcurl is built w/o SSL-support

[ptahmose]

Description

fix a crash when libcurl was built w/o SSL-support.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

locally

Checklist:

• I followed the Contributing Guidelines.
• I did a self-review.
• I commented my code, particularly in hard-to-understand areas.
• I updated the documentation.
• I updated the version of libCZI following Versioning of libCZI depending on the type of change
  • Bug fix -> PATCH
  • New feature -> MINOR
  • Breaking change -> MAJOR
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[codecov]

Codecov Report

Merging #74 (fdd077b) into main (8cb7ac3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   64.47%   64.47%           
=======================================
  Files          81       81           
  Lines       10303    10303           
=======================================
  Hits         6643     6643           
  Misses       3660     3660           

Flag	Coverage Δ
windows-latest	64.47% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
Src/libCZI/StreamsLib/curlhttpinputstream.cpp	79.67% <100.00%> (ø)

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