trippy: avoid building example binaries

Disable the default behavior of building example binaries "hello-world"
and "traceroute". The latter is particularly problematic as it conflicts
with the system's traceroute binary.

Related: https://github.com/fujiapple852/trippy/pull/1503

pkgs/by-name/tr/trippy/package.nix

@@ -21,6 +21,8 @@ rustPlatform.buildRustPackage rec {
   useFetchCargoVendor = true;
   cargoHash = "sha256-+PaSLq++tKA6dy4CI1EYrEDdXi2TI9XHjvMLfwDp/HA=";
 
+  cargoBuildFlags = [ "--package trippy" ];
+
   postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
     local INSTALL="$out/bin/trip"
     installShellCompletion --cmd trip \