encoding.c: mask dummy flags
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
encoding.c: mask dummy flags
encoding index and ignore dummy flags. [ruby-core:59354] [Bug #9314]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e