gz-sim-model: workaround cli11 bug (#2921)

There is a bug in cli11 for versions >= 2.2 and < 2.5.
This works around the bug for the affected versions.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>
Co-authored-by: Ian Chen <ichen@openrobotics.org>

Author: scpeters

src/cmd/model_main.cc

@@ -145,9 +145,17 @@ void addModelFlags(CLI::App &_app)
     ->expected(0, 1)
     ->default_val("");
 
-  command->add_flag("-p,--pose", opt->pose,
-                "Print the pose of the model.")
-                ->needs(modelCmd);
+  auto poseOption =
+      command->add_flag("-p,--pose", opt->pose,
+                        "Print the pose of the model (only useful with --model).");
+  // Don't specify that it needs --model for cli11 >= 2.2.0, < 2.5
+  // See https://github.com/gazebosim/gz-sim/issues/2918
+  if (!(CLI11_VERSION_MAJOR == 2 &&
+        CLI11_VERSION_MINOR >= 2 &&
+        CLI11_VERSION_MINOR < 5))
+  {
+    poseOption->needs(modelCmd);
+  }
 
   _app.callback([opt](){ runModelCommand(*opt); });
 }