bpo-42955: Add _overlapped to sys.stdlib_module_names (GH-25122)

diff --git a/Python/stdlib_module_names.h b/Python/stdlib_module_names.h
index 9804385..b09b8dc 100644
--- a/Python/stdlib_module_names.h
+++ b/Python/stdlib_module_names.h
@@ -52,6 +52,7 @@ static const char* _Py_stdlib_module_names[] = {
 "_opcode",
 "_operator",
 "_osx_support",
+"_overlapped",
 "_pickle",
 "_posixshmem",
 "_posixsubprocess",
diff --git a/Tools/scripts/generate_stdlib_module_names.py b/Tools/scripts/generate_stdlib_module_names.py
index 046b9eb..716a6d4 100644
--- a/Tools/scripts/generate_stdlib_module_names.py
+++ b/Tools/scripts/generate_stdlib_module_names.py
@@ -42,6 +42,7 @@
 # Windows extension modules
 WINDOWS_MODULES = (
     '_msi',
+    '_overlapped',
     '_testconsole',
     '_winapi',
     'msvcrt',