cryptsetup: add PKG_LICENSE information

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/cryptsetup/Makefile

@@ -10,6 +10,8 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=cryptsetup
 PKG_VERSION:=1.6.6
 PKG_RELEASE:=1
+PKG_LICENSE:=GPL-2.0+ LGPL-2.1+
+PKG_LICENSE_FILES:=COPYING COPYING.LGPL
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/utils/cryptsetup/v1.6