print/hplip(-plugin): update to 3.22.2
- Convert post-patch to real patches because they are easier to maintain.
- Fix a NULL dereference in the scanner backend when D-Bus isn't running.
- Depend on sysutils/py-distro to make hp-toolbox (Device Manager) work again.
- Upstream switched to Avahi for mDNS support. Rename the SNMP option to NETWORK because it's not just SNMP now.
- Don't install some programs related to uninstalling and upgrading of HPLIP and the installation of firmware plugins because they circumvent the package system.
- Install icons in share/icons so desktops can choose an appropriate resolution.
Portions taken from a patch by Oleg Sidorkin <osidorkin@gmail.com>.
PR: 255586, 257034, 257512