Add support for building the Dart VM for Android OS.

runtime/vm/vm.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.
 
 {
   'variables': {
     'builtin_in_cc_file': '../bin/builtin_in.cc',
     'corelib_cc_file': '<(SHARED_INTERMEDIATE_DIR)/corelib_gen.cc',
     'corelib_patch_cc_file': '<(SHARED_INTERMEDIATE_DIR)/corelib_patch_gen.cc',
     'corelib_impl_cc_file': '<(SHARED_INTERMEDIATE_DIR)/corelib_impl_gen.cc',
@@ skipping 18 matching lines @@
         '../platform/platform_sources.gypi',
       ],
       'sources/': [
         # Exclude all _test.[cc|h] files.
         ['exclude', '_test\\.cc|h$'],
       ],
       'include_dirs': [
         '..',
       ],
       'conditions': [
+        ['OS=="android"', {
+          'link_settings': {
+            'libraries': [
+              '-lc',
+              '-lpthread',
+            ],
+          },
+        }],
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
             ],
           },
         }],
         ['OS=="win"', {
           'sources/' : [
@@ skipping 458 matching lines @@
             '--include', 'INTENTIONALLY_LEFT_BLANK',
             '--var_name', 'INTENTIONALLY_LEFT_BLANK_TOO',
             '<(snapshot_test_dart_file)',
           ],
           'message': 'Generating ''<(snapshot_test_dat_file)'' file.'
         },
       ]
     },
   ]
 }