Tests fail with /bin/dash

Singned-off-by: Lars Wendler <polynomial-c@gentoo.org>

--- numactl-2.0.9/test/printcpu
+++ numactl-2.0.9/test/printcpu
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #print cpu it is running on
 declare -a arr
 arr=( $(< /proc/self/stat) )