New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/32403#issuecomment-907859304

Comment:
> My question is how best to handle that. Should they be moved to libngspice and have ngspice then depend on it as well, make another subpackage called something like ngspice-common, or maybe not split off libngspice at all?

I'm honestly ok with the last option.