Simplifies standalone VM Android build.

tools/gyp/configurations_xcode.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # The purpose of this file and others in this directory is to simulate
 # the Chromium build enviroment. This file is included in all GYP
 # files that are used by the Dart project.
 
 # READ BEFORE EDITING:
 # Do not add Dart VM specific configuration to this file. Instead,
 # modify runtime/tools/gyp/runtime-configurations.gypi.
 
 {
   'variables': {
     'xcode_gcc_version%': '<!(python <(DEPTH)/tools/gyp/find_mac_gcc_version.py)',
   },
   'target_defaults': {
     'configurations': {
-      'Dart_Base': {
+      'Dart_Macos_Base': {
         'abstract': 1,
         'xcode_settings': {
           'GCC_VERSION': '<(xcode_gcc_version)',
           'GCC_C_LANGUAGE_STANDARD': 'ansi',
           'GCC_ENABLE_CPP_EXCEPTIONS': 'NO', # -fno-exceptions
           'GCC_ENABLE_CPP_RTTI': 'NO', # -fno-rtti
           'GCC_DEBUGGING_SYMBOLS': 'default', # -g
           'GCC_GENERATE_DEBUGGING_SYMBOLS': 'YES', # Do not strip symbols
           'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES', # -fvisibility=hidden
           'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES', # -fvisibility-inlines-hidden
@@ skipping 16 matching lines @@
           'ALWAYS_SEARCH_USER_PATHS': 'NO',
 
           # Attempt to remove compiler options that Xcode adds by default.
           'GCC_CW_ASM_SYNTAX': 'NO', # Remove -fasm-blocks.
 
           'GCC_ENABLE_PASCAL_STRINGS': 'NO',
           'GCC_ENABLE_TRIGRAPHS': 'NO',
           'COMBINE_HIDPI_IMAGES': 'YES',
         },
       },
+      'Dart_Macos_ia32_Base': {
+        'abstract': 1,
+      },
+      'Dart_Macos_x64_Base': {
+        'abstract': 1,
+      },
+      'Dart_Macos_simarm_Base': {
+        'abstract': 1,
+      },
+      'Dart_Macos_simmips_Base': {
+        'abstract': 1,
+      },
+      'Dart_Macos_Debug': {
+        'abstract': 1,
+      },
+      'Dart_Macos_Release': {
+        'abstract': 1,
+      },
     },
   },
 }