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page: close stdout, reopen stdout/stderr for external viewer and removed useless RFNAMEG flag

we are not using stdout (fd=1) and it, so dup nullfd over it.
this drops the old window reference when using with -w flag.

the RFNAMEG flag isnt needed because we are calling newwindow()
which forks the namespace for us.

reopen stdin/stdout for the external viewer to the new window.

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -1288,9 +1288,9 @@

 		fd = dup(fd, -1);

 		seek(fd, 0, 0);

 	}

-	if(rfork(RFPROC|RFMEM|RFFDG|RFNOTEG|RFNAMEG|RFNOWAIT) == 0){

+	if(rfork(RFPROC|RFMEM|RFFDG|RFNOTEG|RFNOWAIT) == 0){

 		if(newwindow(nil) != -1){

-			dupfds(fd, 1, 2, -1);

+			dupfds(fd, open("/dev/cons", OWRITE), open("/dev/cons", OWRITE), -1);

 			if((fd = open("/dev/label", OWRITE)) >= 0){

 				write(fd, label, strlen(label));

 				close(fd);

@@ -1520,6 +1520,7 @@

 	memset(&m, 0, sizeof(m));

 	if((nullfd = open("/dev/null", ORDWR)) < 0)

 		sysfatal("open: %r");

+	dup(nullfd, 1);

 	lru.lprev = &lru;

 	lru.lnext = &lru;

 	current = root = addpage(nil, "", nil, nil, -1);

-- 

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