Drop some epg/epa backwards compat code for ancient Emacs versions
* lisp/epa.el (epa--select-safe-coding-system): Remove, `select-safe-coding-system' has been present since Emacs 20.3. (epa--encode-coding-string, epa--decode-coding-string): * lisp/epg.el (epg--decode-coding-string, epg--encode-coding-string) (epg--clear-string): Remove, the corresponding Emacs functions are so old they don't show up in NEWS. Furthermore, the fallback for the *-coding-string functions was `identity' which wouldn't have worked anyway, since it only takes a single argument. (epg--make-temp-file): Remove, `make-temp-file' has been present since Emacs 21.1. * lisp/epg-config.el (epg-gpg-program, epg-gpgsm-program) (epg-gpgconf-program, epg-gpg-home-directory) (epg-passphrase-coding-system, epg-debug): Remove unneeded :group parameter.
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