Fixes for C++ examples

[darbyjohnston]

This PR contains a couple of fixes for the C++ examples:

• Modify the include directories to pickup the auto-generated version.h file
• Use || instead of or in C++ code (I know or is technically correct, but Visual Studio still seems to have issues with it)
• Fix a warning in examples\util.cpp about ignoring the return value from realpath
• Enable the C++ examples in the CI so we can catch breaks sooner

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.11%. Comparing base (30f6f56) to head (f903f5f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1967   +/-   ##
=======================================
  Coverage   85.11%   85.11%           
=======================================
  Files         181      181           
  Lines       12774    12774           
  Branches     1206     1206           
=======================================
  Hits        10872    10872           
  Misses       1719     1719           
  Partials      183      183           

Flag	Coverage Δ
py-unittests	85.11% <ø> (ø)

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[meshula]

lgtm