tests/docker: test-build script

Much like test-quick but only builds. This is useful for some of the
build targets like ThreadSanitizer that don't yet pass "make check".
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>

Message-Id: <20161011161625.9070-3-alex.bennee@linaro.org>
Signed-off-by: NFam Zheng <famz@redhat.com>

tests/docker/test-build

+#!/bin/bash -e
+#
+# Quick compile test without the make check step of test-quick.
+#
+# Copyright (c) 2016 Red Hat Inc.
+#
+# Authors:
+#  Fam Zheng <famz@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2
+# or (at your option) any later version. See the COPYING file in
+# the top-level directory.
+
+. common.rc
+
+cd "$BUILD_DIR"
+
+DEF_TARGET_LIST="x86_64-softmmu,aarch64-softmmu"
+TARGET_LIST=${TARGET_LIST:-$DEF_TARGET_LIST} \
+build_qemu