[libc-commits] [libc] [libc] add SIG_HOLD for linux/gpu (PR #165007)

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c8ef wrote:

Based on the discussion on Discord, we should make the headers that use `__LLVM_LIBC_CAST` self-contained. So I added the `__llvm-libc-common.h` inclusion here.

https://github.com/llvm/llvm-project/pull/165007