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rio: copy window labels for menu3

as the menu is displayed, the window might go away or change its
label causing menuhit() to dereference bad memory. just strdup()
the labels before passing to menu3str to prevent accidents.

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

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

@@ -709,10 +709,14 @@

 	}

 	if(n >= nelem(menu3str)-Hidden)

 		n = nelem(menu3str)-Hidden-1;

-	for(i=0; i<n; i++)

-		menu3str[i+Hidden] = hidden[i]->label;

-	menu3str[i+Hidden] = nil;

-

+	for(i=0; i<n; i++){

+		free(menu3str[i+Hidden]);

+		menu3str[i+Hidden] = estrdup(hidden[i]->label);

+	}

+	for(i+=Hidden; menu3str[i]; i++){

+		free(menu3str[i]);

+		menu3str[i] = nil;

+	}

 	sweeping = 1;

 	switch(i = menuhit(3, mousectl, &menu3, wscreen)){

 	case -1:

-- 

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