Fix snprintf on windows problem for test4.

Author: hawicz

tests/test4.c

@@ -11,6 +11,7 @@
 #include "json_inttypes.h"
 #include "json_object.h"
 #include "json_tokener.h"
+#include "snprintf_compat.h"
 
 void print_hex(const char *s)
 {