Use the sreadfrom() wrapper to replace recvfrom() in our code.

lib/setup_once.h

@@ -229,6 +229,13 @@ struct timeval {
 #endif /* HAVE_RECVFROM */
 
 
+#ifdef RECVFROM_TYPE_ARG6_IS_VOID
+#  define RECVFROM_ARG6_T unsigned int
+#else
+#  define RECVFROM_ARG6_T RECVFROM_TYPE_ARG6
+#endif
+
+
 /*
  * Uppercase macro versions of ANSI/ISO is*() functions/macros which
  * avoid negative number inputs with argument byte codes > 127.