New comment by yopito on void-packages repository

https://github.com/void-linux/void-packages/issues/23692#issuecomment-662031623

Comment:
compute `checksum` this way ( is the checksum of the `distfiles` itself):
```
$ sha256sum pari-2.11.4.tar.gz 
bfc88fc4f7352f4840e6e352c72f0369cbea8a45403b1834a6269f3709970b1c  pari-2.11.4.tar.gz
```