loopdetector:Update Makefile for license also added opkg hooks

loop-detector/Makefile

+# Copyright (C) 2019 iopsys
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=loop-detector
@@ -11,6 +17,9 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
 
+PKG_LICENSE:=GPLv2
+PKG_LICENSE_FILES:=COPYING
+
 include $(INCLUDE_DIR)/package.mk