only use build_tests/typical/install.rb for Install builder specs

build_tests/typical/echo_command_ruby_builder.rb

@@ -1,7 +1,7 @@
 build do
   Environment.new do |env|
     env.echo = :command
-    env.Install("inst.exe", "install.rb")
+    env.Copy("copy.rb", "echo_command_ruby_builder.rb")
   end
 
 end