Don't log feature probe error message unless requested

[torben-hansen]

Description of changes:

Feature probes, when "failing", logs e.g. compilation errors. These can be confusing for consumers. Suppress the output unless requested.

Call-outs:

Doesn't affect the build but makes it a tad more user friendly in the limit when compilations are used as feature probes. If haven't enabled the verbose level, we now see this in the log

-- linux_random_h.c probe is negative, NOT enabling HAVE_LINUX_RANDOM_H:                                                         
-- Use -DFEATURE_PROBE_VERBOSE=ON to view feature probe compilation output.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.91%. Comparing base (7da0924) to head (bbda330).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2755   +/-   ##
=======================================
  Coverage   78.91%   78.91%           
=======================================
  Files         677      677           
  Lines      115525   115525           
  Branches    16237    16238    +1     
=======================================
+ Hits        91170    91171    +1     
+ Misses      23559    23556    -3     
- Partials      796      798    +2     

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