include stdint.h for int32_t/uint32_t

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
diff --git a/tests/weston-test.c b/tests/weston-test.c
index 09d8b5e..afda7bc 100644
--- a/tests/weston-test.c
+++ b/tests/weston-test.c
@@ -25,6 +25,7 @@
 
 #include "config.h"
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <signal.h>