[clang-tools-extra] [clang-tidy] New bugprone-unsafe-format-string check (PR #168691)

[Daniel Krupp via cfe-commits]

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dkrupp wrote:

system-header-simulator.h is moved to clang-tools-extra/test/clang-tidy/checkers/Inputs/Headers/std

https://github.com/llvm/llvm-project/pull/168691