Restore support for Microsoft VC6 compiler.
Some functions in the msvcrt module are skipped,
and socket.ioctl is enabled only when using a more recent Platform SDK.
(and yes, there are still companies that use a 10-years old compiler)
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index c5635ba..b2b3afd 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -153,7 +153,7 @@
to a 8k margin. */
#define PYOS_STACK_MARGIN 2048
-#if defined(WIN32) && !defined(MS_WIN64) && defined(_MSC_VER)
+#if defined(WIN32) && !defined(MS_WIN64) && defined(_MSC_VER) && _MSC_VER >= 1300
/* Enable stack checking under Microsoft C */
#define USE_STACKCHECK
#endif