New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/21272#issuecomment-621552115

Comment:
Thinking about it now.
I think the glob is too complicated and may not worth our effort.

I think we should add checksum for $license_files instead.
It will force people check if license was changed, it's unusual to change LICENSE file, except bump year, or change license.
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