* pgg-epg.el (pgg-epg-decrypt-region): Don't call

* pgg-epg.el (pgg-epg-decrypt-region): Don't call
decode-coding-string if it is not bound.

* epa-file.el (epa-file--encode-coding-string): New alias.
(epa-file--decode-coding-string): New alias.
(epa-file-write-region): Use epa-file--encode-coding-string.
(epa-file-decode-and-insert): Use epa-file--decode-coding-string.

* epa.el (epa--encode-coding-string): New alias.
(epa--decode-coding-string): New alias.
(epa-verify-region): Use epa--encode-coding-string.
(epa-sign-region): Ditto; use epa--decode-coding-string.
(epa-encrypt-region): Ditto.

* epg.el (epg--encode-coding-string): New alias.
(epg--status-GET_HIDDEN): use it.