* common.mk (encs enc trans libencs libenc libtrans): force to run
  enk.mk because common.mk does not know the dependency, but enk.mk
  knows. [ruby-dev:48530] [Bug #10220]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e