Upgrade unbound library

These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).

external/unbound/CMakeLists.txt

@@ -1,21 +1,21 @@
 # Copyright (c) 2014-2017, The Monero Project
-# 
+#
 # All rights reserved.
-# 
+#
 # Redistribution and use in source and binary forms, with or without modification, are
 # permitted provided that the following conditions are met:
-# 
+#
 # 1. Redistributions of source code must retain the above copyright notice, this list of
 #    conditions and the following disclaimer.
-# 
+#
 # 2. Redistributions in binary form must reproduce the above copyright notice, this list
 #    of conditions and the following disclaimer in the documentation and/or other
 #    materials provided with the distribution.
-# 
+#
 # 3. Neither the name of the copyright holder nor the names of its contributors may be
 #    used to endorse or promote products derived from this software without specific
 #    prior written permission.
-# 
+#
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
@@ -85,13 +85,16 @@ set(common_src
   iterator/iter_resptype.c
   iterator/iter_scrub.c
   iterator/iter_utils.c
+  respip/respip.c
   services/listen_dnsport.c
   services/localzone.c
   services/mesh.c
   services/modstack.c
   services/outbound_list.c
   services/outside_network.c
+  services/view.c
   util/alloc.c
+  util/as112.c
   util/config_file.c
   util/configlexer.c
   util/configparser.c
@@ -112,6 +115,7 @@ set(common_src
   util/storage/slabhash.c
   util/timehist.c
   util/tube.c
+  util/ub_event.c
   util/winsock_event.c
   validator/autotrust.c
   validator/val_anchor.c
@@ -131,7 +135,7 @@ set(common_src
 
 set(compat_src)
 
-foreach (symbol IN ITEMS ctime_r gmtime_r inet_aton inet_ntop inet_pton isblank malloc memmove snprintf strlcat strlcpy strptime explicit_bzero arc4random arc4random_uniform reallocarray)
+foreach (symbol IN ITEMS ctime_r gmtime_r inet_aton inet_ntop inet_pton isblank malloc memmove snprintf strsep strlcat strlcpy strptime explicit_bzero arc4random arc4random_uniform reallocarray)
   string(TOUPPER "${symbol}" upper_sym)
   if (NOT HAVE_${upper_sym})
     list(APPEND compat_src
@@ -222,4 +226,4 @@ if (INSTALL_VENDORED_LIBUNBOUND)
     endif()
     install(TARGETS unbound
         ARCHIVE DESTINATION ${lib_folder})
-endif()    
+endif()