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std: move NuttX to use arc4random for random number generation arc4random support in libc merged in https://github.com/rust-lang/libc/pull/4464, so: * Move `target_os = "nuttx"` from unix_legacy to arc4random section * This aligns NuttX with other POSIX-compliant systems that support arc4random * Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.