gnunet: add runtime test

Test if gnunet-arm is executable for now.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/gnunet/test.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+case "$1" in
+	"gnunet")
+		gnunet-arm --version | grep "$2"
+		;;
+esac