fix quoting bug for make dist


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@46553 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-06-26

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@46554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e