curses: Move pinentry_utf8_to_local/pinentry_local_to_utf8.
* pinentry/pinentry-curses.c (pinentry_utf8_to_local): Now here. (pinentry_local_to_utf8, lc_ctype_unknown_warning): Likewise. * pinentry/pinentry.c: Moved to pinentry-curses.c. (pinentry_get_pgmname): New.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>