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.

g10/gpg.c

@@ -430,6 +430,7 @@ enum cmd_and_opt_values
     oNoIncludeKeyBlock,
     oForceSignKey,
     oForbidGenKey,
+    oRequireCompliance,
 
     oNoop
   };
@@ -890,6 +891,7 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_s (oXauthority, "xauthority", "@"),
   ARGPARSE_s_n (oNoAutostart, "no-autostart", "@"),
   ARGPARSE_s_n (oForbidGenKey,  "forbid-gen-key", "@"),
+  ARGPARSE_s_n (oRequireCompliance, "require-compliance", "@"),
   /* Options which can be used in special circumstances. They are not
    * published and we hope they are never required.  */
   ARGPARSE_s_n (oUseOnlyOpenPGPCard, "use-only-openpgp-card", "@"),
@@ -3596,6 +3598,10 @@ main (int argc, char **argv)
             mopt.forbid_gen_key = 1;
             break;
 
+          case oRequireCompliance:
+            opt.flags.require_compliance = 1;
+            break;
+
 	  case oNoop: break;
 
 	  default: