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libc: set malloctag for runestrdup()

--- a/sys/src/libc/port/runestrdup.c

+++ b/sys/src/libc/port/runestrdup.c

@@ -9,6 +9,6 @@

 	ns = malloc(sizeof(Rune)*(runestrlen(s) + 1));

 	if(ns == 0)

 		return 0;

-

+	setmalloctag(ns, getcallerpc(&s));

 	return runestrcpy(ns, s);

 }