[arch-general] [signoff] vpnc 0.5.3-4

Fix FS#25002 (add net-tools dep for now), FS#23452 (fix path, add optdepend) and FS#25095 (add supplied patch). Please sign off. I also want to mention that I don't use vpnc anymore, and haven't done so for years. I don't want to keep maintaining it, so if there are takers among the devs, please step up.