Let snmp backend also use manufacturer-specific MIBs

Let snmp backend also use manufacturer-specific MIBs

 … of HP and Ricoh to obtain the device IDs of network-connected
 printers. This way we get more reliable information about make and model
 and in addition the supported page description languages, which allows one to
 identify whether an optional PostScript add-on is installed or for an
 unsupported printer which generic PPD is the best choice (requested by
 Ricoh).
Bug: https://github.com/apple/cups/issues/3552
Patch-Name: Let-snmp-backend-also-use-manufacturer-specific-MIBs.patch