dosfstools: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dosfstools/dosfstools.mk

@@ -6,6 +6,8 @@
 
 DOSFSTOOLS_VERSION = 3.0.12
 DOSFSTOOLS_SITE = http://fossies.org/linux/misc/
+DOSFSTOOLS_LICENSE = GPLv3+
+DOSFSTOOLS_LICENSE_FILES = COPYING
 MKDOSFS_BINARY = mkdosfs
 DOSFSCK_BINARY = dosfsck
 DOSFSLABEL_BINARY = dosfslabel