tests: Include "config.h" as first header

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/tests/weston-test-runner.c b/tests/weston-test-runner.c
index ce0a670..3e1ace6 100644
--- a/tests/weston-test-runner.c
+++ b/tests/weston-test-runner.c
@@ -21,6 +21,7 @@
  */
 
 #include "config.h"
+
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -30,6 +31,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <signal.h>
+
 #include "weston-test-runner.h"
 
 #define SKIP 77