Added the memdebug include file

lib/file.c

@@ -103,6 +103,10 @@
 #define _MPRINTF_REPLACE /* use our functions only */
 #include <curl/mprintf.h>
 
+/* The last #include file should be: */
+#ifdef MALLOCDEBUG
+#include "memdebug.h"
+#endif
 
 CURLcode file(struct connectdata *conn)
 {