Fix exception namespace
From: Tietew (Toru Iwase) tietew@tietew.net
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66972 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Fix exception namespace
Errno namespace. [ruby-core:91362] [Bug #15577]
From: Tietew (Toru Iwase) tietew@tietew.net
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66972 b2dd03c8-39d4-4d8f-98ff-823fe69b080e