modulefinder: remove unused argument

This was removed in python#9616

mypy/main.py

@@ -930,7 +930,7 @@ def set_strict_flags() -> None:
                                    ())
         targets = []
         # TODO: use the same cache that the BuildManager will
-        cache = FindModuleCache(search_paths, fscache, options, special_opts.packages)
+        cache = FindModuleCache(search_paths, fscache, options)
         for p in special_opts.packages:
             if os.sep in p or os.altsep and os.altsep in p:
                 fail("Package name '{}' cannot have a slash in it.".format(p),

mypy/modulefinder.py

@@ -106,8 +106,7 @@ class FindModuleCache:
     def __init__(self,
                  search_paths: SearchPaths,
                  fscache: Optional[FileSystemCache] = None,
-                 options: Optional[Options] = None,
-                 ns_packages: Optional[List[str]] = None) -> None:
+                 options: Optional[Options] = None) -> None:
         self.search_paths = search_paths
         self.fscache = fscache or FileSystemCache()
         # Cache for get_toplevel_possibilities:
@@ -117,7 +116,6 @@ def __init__(self,
         self.results = {}  # type: Dict[str, ModuleSearchResult]
         self.ns_ancestors = {}  # type: Dict[str, str]
         self.options = options
-        self.ns_packages = ns_packages or []  # type: List[str]
 
     def clear(self) -> None:
         self.results.clear()