parseopt: add PARSE_OPT_KEEP_UNKNOWN
Add a parseopt flag, PARSE_OPT_KEEP_UNKNOWN, that can be used to keep unknown options in argv, similar to the existing KEEP flags. Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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