* parse.y: fix build error with bison-3.0.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42282 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* test/rexml/test_notationdecl_parsetest.rb: Add tests that focus
  public ID in external ID notation declaration.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42283 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* test/rexml/test_notationdecl_parsetest.rb: Fix a typo.
  Extern  ID ->
  ExternalID
        ^^


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e