iw: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/iw/iw.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/software/network/iw/sha256sums.asc
+sha256	bd5c0a92cea799e22bcf431dfe0f91a3ba293ce078e9d95e53d7dbb26df24b8a	iw-3.15.tar.xz