dir.c: set errno
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: set errno
the last error by GetLastError() and map to errno. [Bug #10015]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e