support DragonFly BSD.  [ruby-dev:26984]

* object.c (rb_mod_cvar_get, rb_mod_cvar_set): document fix from
  sheepman <sheepman@sheepman.sakura.ne.jp>; a bug in visibility
  description.  [ruby-dev:26965]

* sprintf.c (rb_f_sprintf): warn "too many argument" on verbose
  mode (-v/-w); backported from 1.9.  [ruby-dev:26963]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@9102 b2dd03c8-39d4-4d8f-98ff-823fe69b080e