Try to fix mailcap parsing again to respect Emacs defaults
* lisp/net/mailcap.el (mailcap--computed-mime-data): New variable. (mailcap-parse-mailcaps): Don't delete Emacs-distributed fallback values (bug#40247). (mailcap-add-mailcap-entry): Extend to allow working on different variables. (mailcap-add): Store data in mailcap-user-mime-data, since it should be heeded first.
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