btrfs-progs: 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/btrfs-progs/btrfs-progs.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/kernel/people/mason/btrfs-progs/sha256sums.asc
+sha256	9a7651df6c0430b75fa0637519ca5be29a756684dada241b4398007ae3cb0b5e	btrfs-progs-v3.16.tar.xz