gpg: New option --require-compliance.
* g10/options.h (opt): Add field flags.require_compliance. * g10/gpg.c (oRequireCompliance): New. (opts): Add --require-compliance. (main): Set option. * g10/mainproc.c (proc_encrypted): Emit error if non de-vs compliant. (check_sig_and_print): Ditto. * g10/encrypt.c (encrypt_crypt): Ditto.
Note that in the --encrypt and --verify cased other checks may kick in
earlier than this new --require-compliance controlled one.