Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/winsound.pyi

@@ -0,0 +1,27 @@
+import sys
+from typing import Optional, Union, overload
+from typing_extensions import Literal
+
+if sys.platform == "win32":
+    SND_FILENAME: int
+    SND_ALIAS: int
+    SND_LOOP: int
+    SND_MEMORY: int
+    SND_PURGE: int
+    SND_ASYNC: int
+    SND_NODEFAULT: int
+    SND_NOSTOP: int
+    SND_NOWAIT: int
+
+    MB_ICONASTERISK: int
+    MB_ICONEXCLAMATION: int
+    MB_ICONHAND: int
+    MB_ICONQUESTION: int
+    MB_OK: int
+    def Beep(frequency: int, duration: int) -> None: ...
+    # Can actually accept anything ORed with 4, and if not it's definitely str, but that's inexpressible
+    @overload
+    def PlaySound(sound: Optional[bytes], flags: Literal[4]) -> None: ...
+    @overload
+    def PlaySound(sound: Optional[Union[str, bytes]], flags: int) -> None: ...
+    def MessageBeep(type: int = ...) -> None: ...