configure: Do not generate two stage0 rustlib dirs when --libdir is set

configure

@@ -1361,16 +1361,22 @@ for h in $CFG_HOST
 do
     for t in $CFG_TARGET
     do
+        # host bin dir stage0
+        make_dir $h/stage0/bin
+
         # host lib dir stage0
         make_dir $h/stage0/lib
 
+        # host test dir stage0
+        make_dir $h/stage0/test
+
         # target bin dir stage0
         make_dir $h/stage0/lib/rustlib/$t/bin
 
         # target lib dir stage0
         make_dir $h/stage0/lib/rustlib/$t/lib
 
-        for i in 0 1 2 3
+        for i in 1 2 3
         do
             # host bin dir
             make_dir $h/stage$i/bin