Seat method to set the current trust status.

In terminal-based GUI applications, this is passed through to
term_set_trust_status, to toggle whether lines are prefixed with the
new trust sigil. In console applications, the function returns false,
indicating to the backend that it should employ some other technique
for spoofing protection.

unix/uxcons.c

@@ -414,6 +414,11 @@ static int console_askappend(LogPolicy *lp, Filename *filename,
 	return 0;
 }
 
+bool console_set_trust_status(Seat *seat, bool trusted)
+{
+    return false;
+}
+
 /*
  * Warn about the obsolescent key file format.
  *