merge revision(s) 40478: [Backport #8334]
* dir.c (dir_set_pos): Fix a compilation error when seekdir() is not exist.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 40478: [Backport #8334]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e