include API after undef windows.h LoadLibrary

[aaronj0]

We lose CppImpl::LoadLibrary otherwise, fixed an error on ROOT's Windows CI when using Dispatch to load the API

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.75%. Comparing base (a0d70b5) to head (2aa8427).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #854   +/-   ##
=======================================
  Coverage   79.75%   79.75%           
=======================================
  Files          11       11           
  Lines        4035     4031    -4     
=======================================
- Hits         3218     3215    -3     
+ Misses        817      816    -1     

Files with missing lines	Coverage Δ
include/CppInterOp/Dispatch.h	89.18% <ø> (ø)

... and 1 file with indirect coverage changes

Files with missing lines	Coverage Δ
include/CppInterOp/Dispatch.h	89.18% <ø> (ø)

... and 1 file with indirect coverage changes

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[vgvassilev]

LGTM!