[libc-commits] [libc] [libc][stdlib] Remove LIBC_THREAD_LOCAL from rand_next (PR #96245)

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PiJoules wrote:

> I'm talking about the `class ThreadLocal` we have in src/stdlib/rand_util.h, of which rand is the only user. I think that can get deleted, too, in this PR.

Done

https://github.com/llvm/llvm-project/pull/96245