treewide: remove redundant definitions from package Makefiles

package/gluon-mesh-batman-adv/Makefile

package/gluon-mesh-vpn-core/Makefile

package/gluon-mesh-vpn-fastd/Makefile

package/gluon-mesh-vpn-tunneldigger/Makefile

package/gluon-neighbour-info/Makefile

package/gluon-node-info/Makefile

package/gluon-radv-filterd/Makefile

package/gluon-radvd/Makefile

package/gluon-respondd/Makefile

package/gluon-setup-mode/Makefile

package/gluon-site/Makefile

package/gluon-status-page/Makefile

package/gluon-wan-dnsmasq/Makefile

package/gluon-web-admin/Makefile

package/gluon-web-autoupdater/Makefile

package/gluon-web-logging/Makefile

package/gluon-web-mesh-vpn-fastd/Makefile

package/gluon-web-model/Makefile

package/gluon-web-network/Makefile

package/gluon-web-node-role/Makefile