agent: Add option --allow-emacs-pinentry
* agent/agent.h (opt): Add field allow_emacs_pinentry. * agent/call-pinentry.c (start_pinentry): Act upon new var. * agent/gpg-agent.c (oAllowEmacsPinentry): New. (opts): Add option --allow-emacs-pinentry. (parse_rereadable_options): Set this option. * tools/gpgconf-comp.c (gc_options_gpg_agent): Add new option.
gpgconf-comp and manual entry added by wk.
- Signed-off-by: Werner Koch <wk@gnupg.org>