[clang-tools-extra] clang tidy: add header ignore option to include duplicate files (PR #167046)

[Baranov Victor via cfe-commits]

================
@@ -487,6 +487,10 @@ Changes in existing checks
   <clang-tidy/checks/readability/uppercase-literal-suffix>` check to recognize
   literal suffixes added in C++23 and C23.
 
+- Improved :doc:`readability-duplicate-include
+  <clang-tidy/checks/readability/duplicate-include>` check by introducing the
+  ``AllowedDuplicateIncludes`` option, which exempts specified headers from
+  duplicate include warnings.
 - Improved :doc:`readability-use-concise-preprocessor-directives
----------------
vbvictor wrote:

```suggestion
  duplicate include warnings.
  
- Improved :doc:`readability-use-concise-preprocessor-directives
```

https://github.com/llvm/llvm-project/pull/167046