Makefile: add postinst ... $(call GluonCheckSite,check_site.lua)

Makefile

 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=gluon-ssid-changer
-PKG_VERSION:=2
+PKG_VERSION:=3
 PKG_RELEASE:=$(GLUON_BRANCH)
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 
-include $(INCLUDE_DIR)/package.mk
+include $(GLUONDIR)/include/package.mk
 
 define Package/gluon-ssid-changer
 	SECTION:=gluon
@@ -40,4 +40,9 @@ define Package/gluon-ssid-changer/install
 	./gluonShellDiet.sh $(1)/lib/gluon/ssid-changer/ssid-changer.sh
 endef
 
+define Package/gluon-ssid-changer/postinst
+#!/bin/sh
+$(call GluonCheckSite,check_site.lua)
+endef
+
 $(eval $(call BuildPackage,gluon-ssid-changer))