Don't show flags from config settings in "nix --help"

src/nix/verify.cc

@@ -19,8 +19,13 @@ struct CmdVerify : StorePathsCommand
     {
         mkFlag(0, "no-contents", "do not verify the contents of each store path", &noContents);
         mkFlag(0, "no-trust", "do not verify whether each store path is trusted", &noTrust);
-        mkFlag('s', "substituter", {"store-uri"}, "use signatures from specified store", 1,
-            [&](Strings ss) { substituterUris.push_back(ss.front()); });
+        mkFlag()
+            .longName("substituter")
+            .shortName('s')
+            .labels({"store-uri"})
+            .description("use signatures from specified store")
+            .arity(1)
+            .handler([&](Strings ss) { substituterUris.push_back(ss.front()); });
         mkIntFlag('n', "sigs-needed", "require that each path has at least N valid signatures", &sigsNeeded);
     }