* pinentry/pinentry.h (struct pinentry): Add fields
formatted_passphrase, formatted_passphrase_label,
formatted_passphrase_tt, formatted_passphrase_hint.
* pinentry/pinentry.c (pinentry_reset): Free the fields.
(option_handler): Add options "formatted-passphrase",
"formatted-passphrase-label", "formatted-passphrase-tt",
"formatted-passphrase-hint".