Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/distutils/util.pyi

@@ -0,0 +1,23 @@
+from typing import Any, Callable, List, Mapping, Optional, Tuple
+
+def get_platform() -> str: ...
+def convert_path(pathname: str) -> str: ...
+def change_root(new_root: str, pathname: str) -> str: ...
+def check_environ() -> None: ...
+def subst_vars(s: str, local_vars: Mapping[str, str]) -> None: ...
+def split_quoted(s: str) -> List[str]: ...
+def execute(
+    func: Callable[..., None], args: Tuple[Any, ...], msg: Optional[str] = ..., verbose: bool = ..., dry_run: bool = ...
+) -> None: ...
+def strtobool(val: str) -> bool: ...
+def byte_compile(
+    py_files: List[str],
+    optimize: int = ...,
+    force: bool = ...,
+    prefix: Optional[str] = ...,
+    base_dir: Optional[str] = ...,
+    verbose: bool = ...,
+    dry_run: bool = ...,
+    direct: Optional[bool] = ...,
+) -> None: ...
+def rfc822_escape(header: str) -> str: ...