use TIMEVAL typedef with select()

This prevents the compatibility struct timeval definition in
sys/time.h from potentially getting used with select() here.

https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-select

apps/openssl/compat/poll_win.c

@@ -253,7 +253,7 @@ poll(struct pollfd *pfds, nfds_t nfds, int timeout_ms)
  timeout_ms = INFINITE;
 
  do {
- struct timeval tv;
+ TIMEVAL tv;
  tv.tv_sec = 0;
  tv.tv_usec = looptime_ms * 1000;
  int handle_signaled = 0;