Add cli11 to the list of general dependencies

Starting in jetty the CLI depends on CLI11. I receently got a new Mac for personal use and decided to try following these instructions and ran into the issue that we need CLI11 for jetty and above.

Signed-off-by: Arjo Chakravarty <[email protected]>

Author: arjo129

jetty/install_osx_src.md

@@ -81,7 +81,7 @@ brew install --cask xquartz
 General dependencies:
 
 ```bash
-brew install assimp boost bullet cmake cppzmq dartsim doxygen eigen fcl ffmpeg flann freeimage freetype gdal gflags google-benchmark ipopt jsoncpp libccd libyaml libzzip libzip nlopt ode open-scene-graph ossp-uuid ogre1.9 ogre2.3 pkg-config protobuf qt@6 qwt rapidjson ruby tbb tinyxml2 urdfdom zeromq
+brew install assimp boost bullet cmake cppzmq dartsim doxygen eigen fcl ffmpeg flann freeimage freetype gdal gflags google-benchmark ipopt jsoncpp libccd libyaml libzzip libzip nlopt ode open-scene-graph ossp-uuid ogre1.9 ogre2.3 pkg-config protobuf qt@6 qwt rapidjson ruby tbb tinyxml2 urdfdom zeromq cli11
 ```
 
 ## Building the Gazebo Libraries