wallet: Do not include server symbols

ui_interface is in libbitcoin_server and can not be included in the
wallet because the wallet does not link with server symbols.

src/Makefile.am

@@ -234,6 +234,7 @@ BITCOIN_CORE_H = \
   util/threadnames.h \
   util/time.h \
   util/translation.h \
+  util/ui_change_type.h \
   util/url.h \
   util/vector.h \
   validation.h \

src/interfaces/wallet.cpp

@@ -13,11 +13,11 @@
 #include <script/standard.h>
 #include <support/allocators/secure.h>
 #include <sync.h>
-#include <ui_interface.h>
 #include <uint256.h>
 #include <util/check.h>
 #include <util/ref.h>
 #include <util/system.h>
+#include <util/ui_change_type.h>
 #include <wallet/context.h>
 #include <wallet/feebumper.h>
 #include <wallet/fees.h>

src/interfaces/wallet.h

@@ -9,8 +9,8 @@
 #include <pubkey.h>                    // For CKeyID and CScriptID (definitions needed in CTxDestination instantiation)
 #include <script/standard.h>           // For CTxDestination
 #include <support/allocators/secure.h> // For SecureString
-#include <ui_interface.h>              // For ChangeType
 #include <util/message.h>
+#include <util/ui_change_type.h>
 
 #include <functional>
 #include <map>

src/ui_interface.h

@@ -20,14 +20,6 @@ class connection;
 }
 } // namespace boost
 
-/** General change type (added, updated, removed). */
-enum ChangeType
-{
-    CT_NEW,
-    CT_UPDATED,
-    CT_DELETED
-};
-
 /** Signals for UI communication. */
 class CClientUIInterface
 {

src/util/ui_change_type.h

@@ -0,0 +1,15 @@
+// Copyright (c) 2012-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_UI_CHANGE_TYPE_H
+#define BITCOIN_UTIL_UI_CHANGE_TYPE_H
+
+/** General change type (added, updated, removed). */
+enum ChangeType {
+    CT_NEW,
+    CT_UPDATED,
+    CT_DELETED
+};
+
+#endif // BITCOIN_UTIL_UI_CHANGE_TYPE_H

src/wallet/wallet.h

@@ -13,11 +13,11 @@
 #include <policy/feerate.h>
 #include <psbt.h>
 #include <tinyformat.h>
-#include <ui_interface.h>
 #include <util/message.h>
 #include <util/strencodings.h>
 #include <util/string.h>
 #include <util/system.h>
+#include <util/ui_change_type.h>
 #include <validationinterface.h>
 #include <wallet/coinselection.h>
 #include <wallet/crypter.h>