wrapper.c: add a new function unlink_or_msg
This behaves like unlink_or_warn except that on failure it writes the message to its 'err' argument, which the caller can display in an appropriate way or ignore. Signed-off-by: NRonnie Sahlberg <sahlberg@google.com> Reviewed-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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