Introduce Py_SOCKET_FD_CAN_BE_GE_FD_SETSIZE.
Proposed by Tim Peters.
diff --git a/PC/pyconfig.h b/PC/pyconfig.h
index 33777dc..bb16cfb 100644
--- a/PC/pyconfig.h
+++ b/PC/pyconfig.h
@@ -572,4 +572,9 @@
 
 /* Define if you have the thread library (-lthread).  */
 /* #undef HAVE_LIBTHREAD */
+
+/* WinSock does not use a bitmask in select, and uses
+   socket handles greater than FD_SETSIZE */
+#define Py_SOCKET_FD_CAN_BE_GE_FD_SETSIZE
+
 #endif /* !Py_CONFIG_H */