New comment by mcpcpc on void-packages repository

https://github.com/void-linux/void-packages/pull/26866#issuecomment-743207916

Comment:
> Since options are determined at compile time, could you add something similar to https://github.com/void-linux/void-packages/blob/master/srcpkgs/dwm/template#L14 to copy a custom config.h over?

Updated the template for a custom config.h file.