[clang-tools-extra] [clang-tidy] warn when `true` is used as a preprocessor keyword in C (PR #128265)

[via cfe-commits]

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+.. title:: clang-tidy - bugprone-true-macro
+
+bugprone-true-macro
+===================
+
+In C++, ``true`` is considered a keyword by the preprocessor so an ``#if true`` enters the true branch,
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EugeneZelenko wrote:

Please synchronize first statement with Release Notes. Please follow 80-characters limit.

https://github.com/llvm/llvm-project/pull/128265