ext/Setup.nacl: remove trainling space.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47559 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-09-13

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47560 b2dd03c8-39d4-4d8f-98ff-823fe69b080e