libical: adjust license infos

Signed-off-by: Nicolas Thill <nico@openwrt.org>

libs/libical/Makefile

@@ -15,8 +15,8 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@SF/freeassociation
 PKG_MD5SUM:=
 
-PKG_LICENSE:=GPL-2.0
-PKG_LICENSE_FILE:=COPYING
+PKG_LICENSE:=LGPL-2.1 MPL-1.0
+PKG_LICENSE_FILES:=COPYING
 PKG_MAINTAINER:=Nicolas Thill <nico@openwrt.org>
 
 PKG_FIXUP:=libtool