test-segfault: add missing include of <stdio.h> on Windows

Needed for fprintf (stderr, ...).

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>
(cherry picked from commit 07b7dcd717)

test/test-segfault.c

@@ -14,6 +14,7 @@
 #endif
 
 #ifdef DBUS_WIN
+#include <stdio.h>
 #include <windows.h>
 
 int