Use gpgrt's new option parser for gpgc, gpgsm, and gpg-agent.

* g10/gpgv.c: Use new option parser.
* sm/gpgsm.c: Ditto.
* agent/gpg-agent.c: Ditto.
(opts): Add option --no-options.

This is the next part of changes. The latest libgpg-error is required
so that that re-reading options (SIGHUP) works.

• GnuPG-bug-id: T4788
• Signed-off-by: Werner Koch <wk@gnupg.org>