Allow unused unsafe for vxworks in alligned_malloc to resolve build e…

…rrors

library/std/src/sys/alloc/unix.rs

@@ -71,6 +71,7 @@ cfg_if::cfg_if! {
  }
  } else {
  #[inline]
+ #[cfg_attr(target_os = "vxworks", allow(unused_unsafe))]
  unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
  let mut out = ptr::null_mut();
  // We prefer posix_memalign over aligned_alloc since it is more widely available, and