yasm: add license

Signed-off-by: Julien Floret <julien.floret@6wind.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/yasm/yasm.mk

@@ -6,6 +6,8 @@
 
 YASM_VERSION = 1.3.0
 YASM_SITE = http://www.tortall.net/projects/yasm/releases
+YASM_LICENSE = BSD-2c, BSD-3c, Artistic, GPLv2, LGPLv2
+YASM_LICENSE_FILES = COPYING BSD.txt Artistic.txt GNU_GPL-2.0 GNU_LGPL-2.0
 
 # This sed prevents it compiling 2 programs (vsyasm and ytasm)
 # that are only of use on Microsoft Windows.