[Bug 15466] 'realpath -- /tmp' non-compliant with upcoming POSIX

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15466

--- Comment #1 from Eric Blake <eblake at redhat.com> ---
Similarly, POSIX still requires 'readlink -- /foo' and 'readlink /foo' to
behave identically.  This is implemented correctly when FEATURE_READLINK_FOLLOW
is enabled (as a side effect of accepting the POSIX-mandated -n), but fails
when the feature is disabled (that branch of the code should probably use
single_argv(), similarly to how coreutils/dirname.c was patched).

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