bpo-40650: Include winsock2.h in pytime.c, instead of a full windows.h (GH-20137)

(cherry picked from commit f660567937277cc3a2cd53af77bbb18e905427e8)

Co-authored-by: Minmin Gong <gongminmin@msn.com>
diff --git a/Python/pytime.c b/Python/pytime.c
index 9ff3006..109d526 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -1,6 +1,6 @@
 #include "Python.h"
 #ifdef MS_WINDOWS
-#include <windows.h>
+#include <winsock2.h>         /* struct timeval */
 #endif
 
 #if defined(__APPLE__)