Revert "pytime: include winsock2, so we can have a complete timeval type (#3377)" (#3383)

This reverts commit 83386061, as it broke Windows builds.

Python/pytime.c

 #include "Python.h"
 #ifdef MS_WINDOWS
 #include <windows.h>
-#include <winsock2.h> /* struct timeval */
 #endif
 
 #if defined(__APPLE__)