vty: Use \r\n in the copyright messages

We should use VTY_NEWLINE but our strings are static, always
use \r\n as unix terminals can handle that as well.
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index a4c2d69..6485102 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -69,10 +69,10 @@
 static int daemonize = 0;
 
 const char *openbsc_copyright =
-	"Copyright (C) 2010 Holger Hans Peter Freyther and On-Waves\n"
-	"License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
-	"This is free software: you are free to change and redistribute it.\n"
-	"There is NO WARRANTY, to the extent permitted by law.\n";
+	"Copyright (C) 2010 Holger Hans Peter Freyther and On-Waves\r\n"
+	"License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\r\n"
+	"This is free software: you are free to change and redistribute it.\r\n"
+	"There is NO WARRANTY, to the extent permitted by law.\r\n";
 
 static struct bsc_nat *nat;
 static void bsc_send_data(struct bsc_connection *bsc, const uint8_t *data, unsigned int length, int);