iostat: define license

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/iostat/iostat.mk

@@ -6,6 +6,8 @@
 
 IOSTAT_VERSION = 2.2
 IOSTAT_SITE = http://www.linuxinsight.com/files
+IOSTAT_LICENSE = GPL
+IOSTAT_LICENSE_FILES = LICENSE
 
 iostat-source: $(DL_DIR)/$(IOSTAT_SOURCE)