added missing directory m4/
added missing directory m4/

volth/libvmod-geoip,heldtogether/libvmod-geoip,heldtogether/libvmod-geoip,lampeh/libvmod-geoip,kinsights/libvmod-geoip,kinsights/libvmod-geoip,lampeh/libvmod-geoip,volth/libvmod-geoip