util/mknum.pl: Really allow unset ordinals in development
util/mknum.pl: Really allow unset ordinals in development

Any pre-release tag that includes '-dev' is development.  The ordinals
don't need to be finalized before '-dev' is removed (i.e. a release is
made).

Reviewed-by: Paul Dale <ddec78389666b4f7c9b4d110380c848489a3e4aa@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15578)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl