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

[Baranov Victor via cfe-commits]

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@@ -33,3 +33,21 @@ Because of the intervening macro definitions, this code remains unchanged:
   #define NDEBUG
   #include "assertion.h"
   // ...code with assertions disabled
+
+Option: ``AllowedDuplicateIncludes``
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vbvictor wrote:

Let's name it `IgnoreHeaders`, see https://clang.llvm.org/extra/clang-tidy/checks/misc/include-cleaner.html.

Just copy documentation from there

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