Don't build sqlite_shell when using the system sqlite.

third_party/sqlite/sqlite.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'use_system_sqlite%': 0,
   },
   'includes': [
     '../../build/common.gypi',
@@ skipping 176 matching lines @@
               'sources/': [['exclude', '_unix\\.cc?$']],
             }, {  # else: OS!="win"
               'sources/': [['exclude', '_(w32|win)\\.cc?$']],
             }],
           ],
         }],
       ],
     },
   ],
   'conditions': [
-    ['OS=="linux"', {
+    ['OS=="linux" and not use_system_sqlite', {
       'targets': [
         {
           'target_name': 'sqlite_shell',
           'type': 'executable',
           'dependencies': [
             '../icu38/icu38.gyp:icuuc',
             'sqlite',
           ],
           'sources': [
             'src/shell.c',
             'src/shell_icu_linux.c',
           ],
           'link_settings': {
             'link_languages': ['c++'],
             'libraries': [
               '-ldl',
             ],
           },
         },
       ],
     },]
   ],
 }