autoconf: Error out on --without-shell and --without-perl
Error out on --without-shell/--with-shell=no and --without-perl/--with-perl=no instead of just warning and continuing. Signed-off-by: NJakub Narebski <jnareb@gmail.com> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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