tty,curses: Upon SIGINT, let pinentry exit gracefully.
* pinentry/pinentry-curses.c (dialog_run): Return GPG_ERR_FULLY_CANCELED when EINTR. (curses_cmd_handler): Always setup SIGINT handler. * tty/pinentry-tty.c (tty_cmd_handler): Always setup SIGINT handler.
- GnuPG-bug-id: T6641
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>