python module: inline the dependency methods checking

It can go directly inside the function which immediately uses it.
There's no purpose in looking it up exactly once and using it exactly
once, but looking it up outside the function and complicating the
function signature in order to pass it as a function argument.

mesonbuild/modules/python.py

@@ -282,10 +282,11 @@ class PythonSystemDependency(SystemDependency, _PythonDependencyBase):
 
 
 def python_factory(env: 'Environment', for_machine: 'MachineChoice',
-                   kwargs: T.Dict[str, T.Any], methods: T.List[DependencyMethods],
+                   kwargs: T.Dict[str, T.Any],
                    installation: 'PythonExternalProgram') -> T.List['DependencyGenerator']:
     # We can't use the factory_methods decorator here, as we need to pass the
     # extra installation argument
+    methods = process_method_kw({DependencyMethods.PKGCONFIG, DependencyMethods.SYSTEM}, kwargs)
     embed = kwargs.get('embed', False)
     candidates: T.List['DependencyGenerator'] = []
     pkg_version = installation.info['variables'].get('LDVERSION') or installation.info['version']
@@ -507,10 +508,9 @@ class PythonInstallation(ExternalProgramHolder):
 
         new_kwargs = kwargs.copy()
         new_kwargs['required'] = False
-        methods = process_method_kw({DependencyMethods.PKGCONFIG, DependencyMethods.SYSTEM}, kwargs)
         # it's theoretically (though not practically) possible to not bind dep, let's ensure it is.
         dep: Dependency = NotFoundDependency('python', self.interpreter.environment)
-        for d in python_factory(self.interpreter.environment, for_machine, new_kwargs, methods, self.held_object):
+        for d in python_factory(self.interpreter.environment, for_machine, new_kwargs, self.held_object):
             dep = d()
             if dep.found():
                 break