Platform settings doesn't need permission options.

[chaoren]

Summary

Also removes conflict error message for '-w' between
--user-write and --working-dir.

[clayborg]

Looks good.

source/Commands/CommandObjectPlatform.cpp

DoExecute (Args& args, CommandReturnObject &result)
         }
         return result.Succeeded();
     }
     
     virtual Options *
     GetOptions ()
     {
         if (m_options.DidFinalize() == false)
-        {
-            m_options.Append(new OptionPermissions());
             m_options.Finalize();
-        }
         return &m_options;
     }
 protected:
     
     OptionGroupOptions m_options;
     OptionGroupFile m_option_working_dir;
 
 };