[compiler-rt] [libfuzzer] use timer_create() instead of setitimer() for linux (PR #110274)

[Florian Mayer via llvm-commits]

fmayer wrote:

> ⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️
> 
> You can test this locally with the following command:
> View the diff from clang-format here.

Please fix

https://github.com/llvm/llvm-project/pull/110274