htop: Add PKG_LICENSE_FILES

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

admin/htop/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2007-2012 OpenWrt.org
+# Copyright (C) 2007-2014 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -16,7 +16,7 @@ PKG_SOURCE_URL:=http://hisham.hm/htop/releases/$(PKG_VERSION)/
 PKG_MD5SUM:=e768b9b55c033d9c1dffda72db3a6ac7
 
 PKG_LICENSE:=GPL-2.0
-PKG_LICENSE_FILES:=
+PKG_LICENSE_FILES:=COPYING
 
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1