Remove empty __init__ methods (#8816)

stdlib/select.pyi

@@ -21,7 +21,6 @@ if sys.platform != "win32":
     POLLWRNORM: int
 
 class poll:
-    def __init__(self) -> None: ...
     def register(self, fd: FileDescriptorLike, eventmask: int = ...) -> None: ...
     def modify(self, fd: FileDescriptorLike, eventmask: int) -> None: ...
     def unregister(self, fd: FileDescriptorLike) -> None: ...