Remove old hack for forcing staleness

Author: MichaelLeeDBX

mypy/build.py

@@ -1602,25 +1602,6 @@ def process_graph(graph: Graph, manager: BuildManager) -> None:
         else:
             process_stale_scc(graph, scc)
 
-        # TODO: This is a workaround to get around the "chaining imports" problem
-        # with the interface checks.
-        #
-        # That is, if we have a file named `module_a.py` which does:
-        #
-        #     import module_b
-        #     module_b.module_c.foo(3)
-        #
-        # ...and if the type signature of `module_c.foo(...)` were to change,
-        # module_a_ would not be rechecked since the interface of `module_b`
-        # would not be considered changed.
-        #
-        # As a workaround, this check will force a module's interface to be
-        # considered stale if anything it imports has a stale interface,
-        # which ensures these changes are caught and propagated.
-        if len(stale_deps) > 0:
-            for id in scc:
-                graph[id].mark_interface_stale()
-
 
 def order_ascc(graph: Graph, ascc: AbstractSet[str], pri_max: int = PRI_ALL) -> List[str]:
     """Come up with the ideal processing order within an SCC.