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

[Joseph Huber via libc-commits]

https://github.com/jhuber6 approved this pull request.

I don't remember why I defined these on the GPU, they probably don't work exactly. Might've just been to make some compilation happy.

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