lib/debug.rb, lib/getoptlong.rb, lib/optparse.rb, lib/time.rb,
  lib/date/format.rb, lib/irb/ruby-lex.rb lib/uri/common.rb: revert
  escape for `-' in character class.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e