Moved the write_stream_flags() call from io.c into main.c so that

it gets called before the transfer starts (thus ensuring that it
can write out un-tweaked values of preserver_[ug]id vars).

io.c

@@ -1548,8 +1548,6 @@ void close_multiplexing_out(void)
 
 void start_write_batch(int fd)
 {
-	write_stream_flags(batch_fd);
-
 	/* Some communication has already taken place, but we don't
 	 * enable batch writing until here so that we can write a
 	 * canonical record of the communication even though the

main.c

@@ -1360,6 +1360,9 @@ int main(int argc,char *argv[])
 		}
 		if (read_batch)
 			read_stream_flags(batch_fd);
+		else
+			write_stream_flags(batch_fd);
+
 	}
 	if (write_batch < 0)
 		dry_run = 1;