Put back improperly removed #include.

Author: tglsfdc

src/backend/utils/adt/inet_net_pton.c

@@ -30,6 +30,7 @@ static const char rcsid[] = "Id: inet_net_pton.c,v 1.4.2.3 2004/03/17 00:40:11 m
 #include <assert.h>
 #include <ctype.h>
 
+#include "utils/builtins.h"
 #include "utils/inet.h"