update-authorized-keys: remove libfilterfile support
update-authorized-keys: remove libfilterfile support

Never needed it. The only commit I found in authorized_keys.txt that
actually had "#if" was for testing this feature.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks