* - Fix select() to also update the fd_set arguments on timeout condition.
- Move the nfds argument restriction to the nsysnet side.
- Allow user-defined FD_SETSIZE, since newlib's fd_set allow custom sizes.
- Define __socklen_t_defined when socklen_t is typedefed.
* Added safety check for poll(): the nsysnet fd must fit in nsysnet_fd_set.
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Co-authored-by: Daniel K. O. (dkosmari) <none@none>
