cramfs: add licensing info

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/cramfs/cramfs.mk

@@ -6,6 +6,8 @@
 
 CRAMFS_VERSION = 1.1
 CRAMFS_SITE = http://downloads.sourceforge.net/project/cramfs/cramfs/$(CRAMFS_VERSION)
+CRAMFS_LICENSE = GPLv2+
+CRAMFS_LICENSE_FILES = COPYING
 
 CRAMFS_DEPENDENCIES = zlib