oob_tcp_component: add #if OPAL_ENABLE_IPV6 around IPv6-specific code

This was CID 1196629

orte/mca/oob/tcp/oob_tcp_component.c

@@ -12,7 +12,7 @@
  *                         All rights reserved.
  * Copyright (c) 2006-2014 Los Alamos National Security, LLC.
  *                         All rights reserved.
- * Copyright (c) 2009-2014 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2009-2015 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2011      Oak Ridge National Labs.  All rights reserved.
  * Copyright (c) 2013-2014 Intel, Inc.  All rights reserved.
  * Copyright (c) 2014      NVIDIA Corporation.  All rights reserved.
@@ -752,6 +752,7 @@ static int component_set_addr(orte_process_name_t *peer,
          * end - we need to remove those extra characters
          */
         hptr = host;
+#if OPAL_ENABLE_IPV6
         if (AF_INET6 == af_family) {
             if ('[' == host[0]) {
                 hptr = &host[1];
@@ -760,6 +761,7 @@ static int component_set_addr(orte_process_name_t *peer,
                 host[strlen(host)-1] = '\0';
             }
         }
+#endif
         addrs = opal_argv_split(hptr, ',');