ISSUE 43: Add BIO_sock_shutdown

This replaces SHUTDOWN/SHUTDOWN2 with BIO_closesocket.

Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/s_client.c

diff --git a/apps/s_client.c b/apps/s_client.c
index cce8e24..247bdbf 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -1735,7 +1735,7 @@
     if (init_client(&s, host, port, socket_family, socket_type) == 0)
     {
         BIO_printf(bio_err, "connect:errno=%d\n", get_last_socket_error());
-        SHUTDOWN(s);
+        BIO_closesocket(s);
         goto end;
     }
     BIO_printf(bio_c_out, "CONNECTED(%08X)\n", s);
@@ -1753,7 +1753,7 @@
         if (getsockname(s, &peer, (void *)&peerlen) < 0) {
             BIO_printf(bio_err, "getsockname:errno=%d\n",
                        get_last_socket_error());
-            SHUTDOWN(s);
+            BIO_closesocket(s);
             goto end;
         }
 
@@ -2135,7 +2135,7 @@
                                "drop connection and then reconnect\n");
                     do_ssl_shutdown(con);
                     SSL_set_connect_state(con);
-                    SHUTDOWN(SSL_get_fd(con));
+                    BIO_closesocket(SSL_get_fd(con));
                     goto re_start;
                 }
             }
@@ -2452,7 +2452,7 @@
     if (in_init)
         print_stuff(bio_c_out, con, full_log);
     do_ssl_shutdown(con);
-    SHUTDOWN(SSL_get_fd(con));
+    BIO_closesocket(SSL_get_fd(con));
  end:
     if (con != NULL) {
         if (prexit != 0)