New review comment by jcgruenhage on void-packages repository

https://github.com/void-linux/void-packages/pull/41306#discussion_r1057507925

Comment:
Care to elaborate? I wrote in the topic above that this approach probably has problems, so this comment doesn't really add anything. Can you give me at least one of:
 - What is the concrete problem with the approach of using `alternatives` here? How will this break?
 - What is the approach that you'd suggest?