fix many tests with preloading

preloading, something akin to builtin, loads some very small predefined (macro) methods for the tests to work (ie call)

test/risc/test_linker1.rb

@@ -16,7 +16,7 @@ module Risc
       assert_equal 1 , mains.length
     end
     def test_assembler_num
-      assert_equal 22 , @linker.assemblers.length
+      assert_equal 2 , @linker.assemblers.length
     end
   end
 end