Merge pull request #166 from ruby/backport-from-ruby

Added condition to path helper for ruby/ruby repository layout

Author: hsbt

spec/spec_helper.rb

@@ -32,7 +32,11 @@ def spec_dir
 end
 
 def lib_dir
-  root_dir.join("lib")
+  if ruby_core?
+    root_dir.join("../lib")
+  else
+    root_dir.join("lib")
+  end
 end
 
 def root_dir