New issue by biopsin on void-packages repository

https://github.com/void-linux/void-packages/issues/34845

Description:
Relates to https://github.com/void-linux/void-packages/pull/33832#issuecomment-1002987653
Proprietary drivers must be in sync with [hplip](https://github.com/void-linux/void-packages/blob/6f33e3848d8d0df38e722ba480ad662ff490e646/srcpkgs/hplip/template) pkg, without we must manually remember to run `hplip-plugin` after update. This also may fail as the command expects `gpgme` dependency to download. 
Propose to include this as a loose extra pkg for those who need it.
[HPDev](https://developers.hp.com/hp-linux-imaging-and-printing/binary_plugin.html) source
[eyeball arch](https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=hplip-plugin)