Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/distutils/sysconfig.pyi

@@ -0,0 +1,14 @@
+from distutils.ccompiler import CCompiler
+from typing import Mapping, Optional, Union
+
+PREFIX: str
+EXEC_PREFIX: str
+
+def get_config_var(name: str) -> Union[int, str, None]: ...
+def get_config_vars(*args: str) -> Mapping[str, Union[int, str]]: ...
+def get_config_h_filename() -> str: ...
+def get_makefile_filename() -> str: ...
+def get_python_inc(plat_specific: bool = ..., prefix: Optional[str] = ...) -> str: ...
+def get_python_lib(plat_specific: bool = ..., standard_lib: bool = ..., prefix: Optional[str] = ...) -> str: ...
+def customize_compiler(compiler: CCompiler) -> None: ...
+def set_python_build() -> None: ...