tests/dup.c: include "tests.h"

This is going to be necessary for the following commit.

diff --git a/tests/dup.c b/tests/dup.c
index 74972698297046e5cf564ef6d0cc2b1fce022ba8..57945aaefe57e6ac1e4ab64081d509b095c6a0d7 100644 (file)
--- a/tests/dup.c
+++ b/tests/dup.c
@@ -1,3 +1,4 @@
+#include "tests.h"
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>