Merge and complete stubs for sysconfig (#1040)

* unify and complete sysconfig stubs

* add missing imports

* and another

stdlib/2and3/sysconfig.pyi

@@ -0,0 +1,19 @@
+# Stubs for sysconfig
+
+from typing import overload, Any, Dict, IO, List, Optional, Tuple, Union
+
+@overload
+def get_config_vars(*args: str) -> List[Any]: ...
+@overload
+def get_config_vars() -> Dict[str, Any]: ...
+def get_config_var(name: str) -> Optional[str]: ...
+def get_scheme_names() -> Tuple[str, ...]: ...
+def get_path_names() -> Tuple[str, ...]: ...
+def get_path(name: str, scheme: str = ..., vars: Optional[Dict[str, Any]] = ..., expand: bool = ...) -> Optional[str]: ...
+def get_paths(scheme: str = ..., vars: Optional[Dict[str, Any]] = ..., expand: bool = ...) -> Dict[str, str]: ...
+def get_python_version() -> str: ...
+def get_platform() -> str: ...
+def is_python_build() -> bool: ...
+def parse_config_h(fp: IO[Any], vars: Optional[Dict[str, Any]]) -> Dict[str, Any]: ...
+def get_config_h_filename() -> str: ...
+def get_makefile_filename() -> str: ...

stdlib/3/sysconfig.pyi

@@ -1,8 +0,0 @@
-# Stubs for sysconfig
-
-# NOTE: These are incomplete!
-
-import typing
-
-def get_config_var(name: str) -> str: ...
-def is_python_build() -> bool: ...