common.mk: reorder args for ENC_MK
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50954 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: reorder args for ENC_MK
as enc/make_encmake.rb ignores any arguments after the target.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50954 b2dd03c8-39d4-4d8f-98ff-823fe69b080e