Fixed Windows build

src/video/windows/SDL_windowsevents.c

@@ -525,8 +525,10 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
                     /* we check for where Windows thinks the system cursor lives in this case, so we don't really lose mouse accel, etc. */
                     POINT pt;
                     RECT hwndRect;
+                    HWND currentHnd;
+
                     GetCursorPos(&pt);
-                    HWND currentHnd = WindowFromPoint( pt );
+                    currentHnd = WindowFromPoint(pt);
                     ScreenToClient(hwnd, &pt);
                     GetClientRect(hwnd, &hwndRect);