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[ld] Link objects in a list

Objects were not linked, which meant that was impossible to run
over the list of object files. We insert at the end of a list
because it keeps the order in which the objects were discovered
in the command line.

--- a/src/cmd/ld/pass1.c

+++ b/src/cmd/ld/pass1.c

@@ -85,6 +85,7 @@

 	Obj *obj;

 	Section sec;

 	Symbol sym;

+	static Obj *last;

 	if ((t = objtype(fp, NULL)) < 0) {

 		error("bad format");

@@ -116,7 +117,10 @@

 	for ( i = 0; getsym(obj, &i, &sym); i++)

 		newsym(&sym, obj);

-	/* TODO: link the object */

+	obj->next = last;

+	last = obj;

+	if (!objhead)

+		objhead = obj;

 	return;