`crypto` module requires `libcrypto` or `libssl` if `libcrypto` is not packaged separately. Not sure how is on centos, but there is an external library required for `crypto` module.
Then again, removing packaging specs for `centos` or other distro is not going to be done like this. You pointed to obs packaging specs, but there are custom extensions, afaik -- so one cannot build rpms locally on own centos server with obs specs. Am I right?
If you need to adjust dependencies in obs specs, do a dedicated PR.
Removing any other specs, it's a subject of a dedicated PR as well, after discussing on mailing lists.