patch from chinmaygarde@ to make progress on mac, ios.

third_party/sqlite/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 config("sqlite_config") {
   include_dirs = [ "." ]
 }
 
 source_set("sqlite") {
   sources = [
@@ skipping 82 matching lines @@
 
     deps = [
       ":sqlite",
       "//third_party/icu",
     ]
   }
 }
 
 if (is_ios) {
   source_set("sqlite_regexp") {
-    defines += [
+    defines = [
       # Necessary to statically compile the extension.
       "SQLITE_CORE",
     ]
     sources = [
       "src/ext/icu/icu.c",
     ]
     deps = [
       "//third_party/icu",
     ]
   }
 }