submodule.c: use argv_array in is_submodule_modified
struct argv_array is easier to use and maintain. Signed-off-by: NStefan Beller <sbeller@google.com> Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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