9704 move socket functions to libc

*** 27,40 ****
   * Use is subject to license terms.
   */
  
          .file   "_so_sendto.s"
  
- /* C library -- __so_sendto                                     */
  /*
!  * int __so_sendto(int sock, const void *buffer, size_t len, int flags,
!  *               const struct sockaddr *addr, int addrlen);
   */
  
  #include "SYS.h"
  
          SYSCALL2_RESTART_RVAL1(__so_sendto,sendto)
--- 27,41 ----
   * Use is subject to license terms.
   */
  
          .file   "_so_sendto.s"
  
  /*
!  * C library -- __so_sendto
!  *
!  * ssize_t __so_sendto(int, const void *, size_t, int, const struct sockaddr *,
!  *     socklen_t);
   */
  
  #include "SYS.h"
  
          SYSCALL2_RESTART_RVAL1(__so_sendto,sendto)