Add missing #elifdef, #elifndef directives to C/C++ highlights (#45672)

Release Notes:

- Add missing #elifdef, #elifndef directives to C/C++ highlights.
f1e87022a7Haojian Wu committed on 1/22/2026, 11:51:31 AM· committed by GitHubparente0212b8
2 files changedLine totals unavailable