Add explicit closesocket(connfd) in ConnectTimeout before returning -ETIMEDOUT

When DNS resolution exhausts the timeout budget, explicitly close the
socket with closesocket() and return -ETIMEDOUT directly, instead of
relying on socket_errno_negative() which reads errno indirectly and
could return the wrong error code on Windows.

Co-authored-by: ithewei <26049660+ithewei@users.noreply.github.com>

Author: Copilot

base/hsocket.c

@@ -346,8 +346,8 @@ int ConnectTimeout(const char* host, int port, int ms) {
     unsigned int elapsed = gettick_ms() - start_time;
     int remaining = ms - (int)elapsed;
     if (remaining <= 0) {
-        errno = ETIMEDOUT;
-        return socket_errno_negative(connfd);
+        closesocket(connfd);
+        return -ETIMEDOUT;
     }
     return ConnectFDTimeout(connfd, remaining);
 }