Ruby

merge from trunk (r28125)

• test/dl/test_cfunc.rb (test_last_error): CFunc.last_error is thread local
  variable. So, if another test calls CFunc#call, it's set.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@28126 b2dd03c8-39d4-4d8f-98ff-823fe69b080e