bug#63931: ls colors one symlink too much as non-broken in symlink chain

[Paul Eggert]

On 2023-06-07 05:23, Pádraig Brady wrote:
-                            ? errno == ENOENT
+                            ? (errno == ENOENT || errno == ELOOP)

This also needs a change in the succeeding comment, which starts "stat 
failed because of ENOENT"