fix test regression caused by !1250

MR https://gitlab.redox-os.org/redox-os/relibc/-/merge_requests/1250 was
done in order to try and patch out an `EINVAL` error, and it was
successful in doing so. Unfortunately, fixing one failure caused
another.

I will continue to do what I can to make relibc's FS layer and redoxFS
smaller, as they have way too much duplicated code.

src/platform/redox/path.rs

@@ -488,7 +488,7 @@ pub(super) fn openat2_path(dirfd: c_int, path: &str, at_flags: c_int) -> Result<
 fn at_flags_to_open_flags(at_flags: c_int) -> c_int {
     let mut out: c_int = 0;
     if at_flags & fcntl::AT_SYMLINK_NOFOLLOW == fcntl::AT_SYMLINK_NOFOLLOW {
-        out |= fcntl::O_NOFOLLOW;
+        out |= fcntl::O_NOFOLLOW | fcntl::O_PATH;
     }
     out
 }