tests: Fix order of includes in barrier/id-fpool/mpsc-queue tests.

config.h must be included first, because it affects all the later
included headers, even the system ones.  Also, struct timeval
requires inclusion of sys/time.h.

This fixes the build with CC=clang CFLAGS='-std=c99 -fgnuc-version=0'

Fixes: aec1081c7df3 ("tests: Add ovs-barrier unit test.")
Fixes: 2eac33c6cc4a ("id-fpool: Module for fast ID generation.")
Fixes: 5396ba5b21c4 ("mpsc-queue: Module for lock-free message passing.")
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

tests/test-barrier.c

@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
+#include <config.h>
+#undef NDEBUG
 #include <getopt.h>
 
-#include <config.h>
-
-#include "ovs-thread.h"
-#include "ovs-rcu.h"
 #include "ovstest.h"
+#include "ovs-rcu.h"
+#include "ovs-thread.h"
 #include "random.h"
 #include "util.h"
 

tests/test-id-fpool.c

@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
+#include <config.h>
 #undef NDEBUG
 #include <assert.h>
 #include <getopt.h>
 #include <string.h>
-
-#include <config.h>
+#include <sys/time.h>
 
 #include "command-line.h"
 #include "id-fpool.h"

tests/test-mpsc-queue.c

@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
+#include <config.h>
 #undef NDEBUG
 #include <assert.h>
 #include <getopt.h>
 #include <string.h>
-
-#include <config.h>
+#include <sys/time.h>
 
 #include "command-line.h"
 #include "guarded-list.h"