tcpproxy: added License Information

Signed-off-by: Christian Pointner <equinox@spreadspace.org>

net/tcpproxy/Makefile

@@ -19,7 +19,9 @@ PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.spreadspace.org/tcpproxy/releases/
 PKG_MD5SUM:=55126473bcde635f9ee019c6caf19bb7
-
+PKG_MAINTAINER:=Christian Pointner <equinox@spreadspace.org>
+PKG_LICENSE:=GPL-3.0+
+PKG_LICENSE_FILE:=LICENSE
 include $(INCLUDE_DIR)/package.mk
 
 
@@ -29,7 +31,6 @@ define Package/tcpproxy
   SUBMENU:=Routing and Redirection
   TITLE:=IPv4/IPv6 tcp connection proxy
   URL:=http://www.spreadspace.org/tcpproxy/
-  MAINTAINER:=Christian Pointner <equinox@spreadspace.org>
 endef
 
 define Package/tcpproxy/conffiles