[libc-commits] [libc] [libc] Implement fileno on Linux (PR #85628)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

ah, this entrypoint needs to be rolled out to the other targets for which the unit test is currently being run on. (aarch64 for example is now red).

https://github.com/llvm/llvm-project/pull/85628