enc/prelude.rb: no encdb and transdb

* enc/prelude.rb: no longer need to load encdb and transdb here.
  Init_enc should load them if possible.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
load.c: defer static linked init

* enc/encinit.c.erb (Init_enc): initialize encdb and transdb
  directly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e