Fix: Launch the python backend on Windows when spaces exist in the path.

Author: vinitkmagnet

src/stub_launcher.cc

@@ -240,10 +240,10 @@ StubLauncher::Launch()
   std::string launch_command;
 
   std::stringstream ss;
-  ss << python_backend_stub << " " << model_path_ << " " << shm_region_name_
+  ss << "\"" << python_backend_stub << "\" \"" << model_path_ << "\" " << shm_region_name_
      << " " << shm_default_byte_size_ << " " << shm_growth_byte_size_ << " "
-     << parent_pid_ << " " << python_lib_ << " " << ipc_control_handle_ << " "
-     << stub_name << " " << runtime_modeldir_;
+     << parent_pid_ << " \"" << python_lib_ << "\" " << ipc_control_handle_ << " \""
+     << stub_name << "\" \"" << runtime_modeldir_ << "\"";
   launch_command = ss.str();
 
   LOG_MESSAGE(