gptfdisk: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gptfdisk/gptfdisk.mk

@@ -6,6 +6,8 @@
 
 GPTFDISK_VERSION = 0.8.6
 GPTFDISK_SITE = http://downloads.sourceforge.net/sourceforge/gptfdisk
+GPTFDISK_LICENSE = GPLv2+
+GPTFDISK_LICENSE_FILES = COPYING
 
 GPTFDISK_TARGETS_$(BR2_PACKAGE_GPTFDISK_GDISK) += gdisk
 GPTFDISK_TARGETS_$(BR2_PACKAGE_GPTFDISK_SGDISK) += sgdisk