[ticket/12941] Check for Sami parse errors on Travis CI.

PHPBB3-12941

travis/setup-unbuffer.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# This file is part of the phpBB Forum Software package.
+#
+# @copyright (c) phpBB Limited <https://www.phpbb.com>
+# @license GNU General Public License, version 2 (GPL-2.0)
+#
+# For full copyright and license information, please see
+# the docs/CREDITS.txt file.
+#
+set -e
+
+sudo apt-get update
+sudo apt-get install -y expect-dev