* ext/dbm/extconf.rb: [DOC] Hide from RDoc
  Some libraries might want to document extconf.rb so RDoc treats it
  like any other ruby program. However, DBM users shouldn't care about
  these methods.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e