[bundler/bundler] Move `lib` helper together with path helpers

https://github.com/bundler/bundler/commit/f2df73bdb4

spec/bundler/support/helpers.rb

@@ -95,10 +95,6 @@ module Spec
       run(cmd, *args)
     end
 
-    def lib
-      root.join("lib")
-    end
-
     def spec
       spec_dir.to_s
     end

spec/bundler/support/path.rb

@@ -104,6 +104,10 @@ module Spec
       tmp("libs", *args)
     end
 
+    def lib
+      root.join("lib")
+    end
+
     def global_plugin_gem(*args)
       home ".bundle", "plugin", "gems", *args
     end