* rfc2231.el (rfc2231-parse-string): "=" should have whitespace

* rfc2231.el (rfc2231-parse-string): "=" should have whitespace
syntax here.

* ietf-drums.el (ietf-drums-syntax-table): "=" should not have
whitespace syntax class when parsing email addresses.

* message.el (message-forward-subject-name-subject): Don't use
mail-decode-encoded-word-string before parsing from.