[libc-commits] [libc] Disable prctl test when building for arm or riscv. (PR #143627)

[Amy Huang via libc-commits]

amykhuang wrote:

Added comment; also linking here to which ones QEMU doesn't support: https://gitlab.com/qemu-project/qemu/-/blob/master/linux-user/syscall.c?ref_type=heads#L6519. 

https://github.com/llvm/llvm-project/pull/143627