Upgrade expat to R_2_2_7

Test: None
Change-Id: I68d014e31a33f07ff684c158b039e12d982db0f8
diff --git a/test-driver-wrapper.sh b/test-driver-wrapper.sh
index 30b34d5..36a1852 100755
--- a/test-driver-wrapper.sh
+++ b/test-driver-wrapper.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /usr/bin/env bash
 #                          __  __            _
 #                       ___\ \/ /_ __   __ _| |_
 #                      / _ \\  /| '_ \ / _` | __|