clone: factor out checking for an alternate path
In a later patch we want to determine if a path is suitable as an alternate from other commands than builtin/clone. Move the checking functionality of `add_one_reference` to `compute_alternate_path` that is defined in cache.h. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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