Add x_exports to xxlimited (#10802)

stdlib/xxlimited.pyi

@@ -7,6 +7,8 @@ class Str: ...
 @final
 class Xxo:
     def demo(self) -> None: ...
+    if sys.version_info >= (3, 11) and sys.platform != "win32":
+        x_exports: int
 
 def foo(__i: int, __j: int) -> Any: ...
 def new() -> Xxo: ...