path: expose `do_git_common_path()` as `repo_common_pathv()`
With the same reasoning as the preceding commit, expose the function
`do_git_common_path()` as `repo_common_pathv()`. While at it, reorder
parameters such that they match the order we have in `repo_git_pathv()`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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