[fix_includes] Remove unused command-line flags

Neither of invoking_command_line or find_affected_targets appear to have
any purpose.

No functional change intended.

fix_includes.py

@@ -2348,10 +2348,6 @@ def main(argv):
                           ' same project.  If not specified, project #includes'
                           ' will be sorted with other non-system #includes.'))
 
-  parser.add_option('--invoking_command_line', default=None,
-                    help=('Internal flag used by iwyu.py, It should be the'
-                          ' command line used to invoke iwyu.py'))
-
   parser.add_option('-m', '--keep_iwyu_namespace_format', action='store_true',
                     default=False,
                     help=('Keep forward-declaration namespaces in IWYU format, '

fix_includes_test.py

@@ -39,8 +39,6 @@ def __init__(self):
     self.only_re = None
     self.safe_headers = False
     self.separate_project_includes = None
-    self.invoking_command_line = 'iwyu.py my_targets'
-    self.find_affected_targets = True
     self.keep_iwyu_namespace_format = False
     self.reorder = True