create a package index

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4337 3c298f89-4303-0410-b956-a3cf2f4a3e73

Makefile

@@ -116,6 +116,7 @@ world: .config FORCE
 	$(MAKE) package/compile
 	$(MAKE) package/install
 	$(MAKE) target/install
+	$(MAKE) package/index
 
 clean: FORCE
 	rm -rf build_* bin

package/Makefile

@@ -55,3 +55,6 @@ install:
 	rm -rf $(BUILD_DIR)/root
 	$(MAKE) install-targets
 
+index: FORCE
+	(cd $(PACKAGE_DIR); $(STAGING_DIR)/usr/bin/ipkg-make-index . > Packages)
+