libs/libidn: Add licensing information

Signed-off-by: Marcel Denia <naoir@gmx.net>

libs/libidn/Makefile

@@ -14,10 +14,14 @@ PKG_RELEASE:=1
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/libidn
 PKG_MD5SUM:=43a6f14b16559e10a492acc65c4b0acc
-PKG_MAINTAINER:=Marcel Denia <naoir@gmx.net>
+
 PKG_FIXUP:=autoreconf
 PKG_REMOVE_FILES:=GNUmakefile aclocal.m4
 
+PKG_LICENSE:=GPLv2 GPLv3 LGPLv2.1 LGPLv3 APACHEv2
+PKG_LICENSE_FILES:=COPYING COPYING.LESSERv2 COPYING.LESSERv3 COPYINGv2 COPYINGv3 java/LICENSE-2.0.txt
+PKG_MAINTAINER:=Marcel Denia <naoir@gmx.net>
+
 PKG_INSTALL:=1
 
 include $(INCLUDE_DIR)/package.mk