New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/24988#discussion_r539009625

Comment:
I think both of these options are bad. If somebody changes or removes the `python3-numpy` files (which becomes more likely the further the versions of the py2 and py3 packages diverge), the symlink or the cross-template copy will break. If this package needs this header, let it own a copy.