Rename remaining refs to mypy-native to librt (#19989)

We agreed that PyPI distribution name is `librt` so use it consistently.

Author: ilevkivskyi

mypy/modulefinder.py

@@ -796,7 +796,7 @@ def default_lib_path(
         custom_typeshed_dir = os.path.abspath(custom_typeshed_dir)
         typeshed_dir = os.path.join(custom_typeshed_dir, "stdlib")
         mypy_extensions_dir = os.path.join(custom_typeshed_dir, "stubs", "mypy-extensions")
-        mypy_native_dir = os.path.join(custom_typeshed_dir, "stubs", "mypy-native")
+        librt_dir = os.path.join(custom_typeshed_dir, "stubs", "librt")
         versions_file = os.path.join(typeshed_dir, "VERSIONS")
         if not os.path.isdir(typeshed_dir) or not os.path.isfile(versions_file):
             print(
@@ -812,13 +812,13 @@ def default_lib_path(
             data_dir = auto
         typeshed_dir = os.path.join(data_dir, "typeshed", "stdlib")
         mypy_extensions_dir = os.path.join(data_dir, "typeshed", "stubs", "mypy-extensions")
-        mypy_native_dir = os.path.join(data_dir, "typeshed", "stubs", "mypy-native")
+        librt_dir = os.path.join(data_dir, "typeshed", "stubs", "librt")
     path.append(typeshed_dir)
 
-    # Get mypy-extensions and mypy-native stubs from typeshed, since we treat them as
+    # Get mypy-extensions and librt stubs from typeshed, since we treat them as
     # "internal" libraries, similar to typing and typing-extensions.
     path.append(mypy_extensions_dir)
-    path.append(mypy_native_dir)
+    path.append(librt_dir)
 
     # Add fallback path that can be used if we have a broken installation.
     if sys.platform != "win32":

mypy/typeshed/stubs/librt/METADATA.toml

@@ -0,0 +1 @@
+version = "0.1.*"