[clang-tools-extra] Fix #35272: Don't replace typedefs in extern c scope (PR #69102)

[via cfe-commits]

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@@ -28,6 +28,15 @@ After:
   using R_t = struct { int a; };
   using R_p = R_t*;
 
+The checker ignores `typedef` within `extern "C" { ... }` blocks.
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Da-Viper wrote:

Would it be preferred to make this an option ? 

https://github.com/llvm/llvm-project/pull/69102