Add TLS_FALLBACK_SCSV documentation, and move s_client -fallback_scsv
handling out of #ifndef OPENSSL_NO_DTLS1 section.

Reviewed-by: Rich Salz <rsalz@openssl.org>

apps/s_client.c

diff --git a/apps/s_client.c b/apps/s_client.c
index d56dc8d..a6f972a 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -942,10 +942,6 @@
 			meth=DTLSv1_2_client_method();
 			socket_type=SOCK_DGRAM;
 			}
-		else if (strcmp(*argv,"-fallback_scsv") == 0)
-			{
-			fallback_scsv = 1;
-			}
 		else if (strcmp(*argv,"-timeout") == 0)
 			enable_timeouts=1;
 		else if (strcmp(*argv,"-mtu") == 0)
@@ -954,6 +950,10 @@
 			socket_mtu = atol(*(++argv));
 			}
 #endif
+		else if (strcmp(*argv,"-fallback_scsv") == 0)
+			{
+			fallback_scsv = 1;
+			}
 		else if	(strcmp(*argv,"-keyform") == 0)
 			{
 			if (--argc < 1) goto bad;