Ruby » Ruby master

merge revision(s) 37174: [Backport #7754]

    * file.c (realpath_rec): prevent link from GC while link_names refers
      the content.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@39092 b2dd03c8-39d4-4d8f-98ff-823fe69b080e