Fix building icu for android on mac host.

icu.gyp

 # Copyright (c) 2012 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_icu%': 0,
     'icu_use_data_file_flag%': 0,
     'want_separate_host_toolset%': 1,
   },
@@ skipping 64 matching lines @@
               'type': 'none',
               'copies': [
                 {
                   'destination': '<(PRODUCT_DIR)',
                   'files': [
                     'windows/icudt.dll',
                   ],
                 },
               ],
             }],
-            [ 'OS == "win" or OS == "mac" or OS == "ios" or OS == "android"', {
-              'sources!': ['linux/icudt46l_dat.S'],
-            }],
-            [ 'OS != "android"', {
-              'sources!': ['android/icudt46l_dat.S'],
-            }],
-            [ 'OS != "mac" and OS != "ios"', {
-              'sources!': ['mac/icudt46l_dat.S'],
-            }],
             [ 'OS != "win" and icu_use_data_file_flag', {
               # Remove any assembly data file.
               'sources/': [['exclude', 'icudt46l_dat']],
               # Compile in the stub data symbol.
               'sources': ['source/stubdata/stubdata.c'],
               # Make sure any binary depending on this gets the data file.
               'link_settings': {
                 'target_conditions': [
                   ['(OS == "mac" and _mac_bundle) or OS=="ios"', {
                     'mac_bundle_resources': [
                       'source/data/in/icudt46l.dat',
                     ],
                   }, {
                     'copies': [{
                       'destination': '<(PRODUCT_DIR)',
                       'files': [
                         'source/data/in/icudt46l.dat',
                       ],
                     }],
                   }],
                 ],  # target_conditions
               },  # link_settings
             }],
           ],
+          'target_conditions': [
+            [ 'OS == "win" or OS == "mac" or OS == "ios" or '
+              '(OS == "android" and (_toolset == "target" or host_os != "linux"))', {
+              'sources!': ['linux/icudt46l_dat.S'],
+            }],
+            [ 'OS != "android" or _toolset == "host"', {
+              'sources!': ['android/icudt46l_dat.S'],
+            }],
+            [ 'OS != "mac" and OS != "ios" and '
+              '(OS != "android" or _toolset != "host" or host_os != "mac")', {
+              'sources!': ['mac/icudt46l_dat.S'],
+            }],
+          ],
         },
         {
           'target_name': 'icui18n',
           'type': '<(component)',
           'sources': [
             'source/i18n/anytrans.cpp',
             'source/i18n/astro.cpp',
             'source/i18n/basictz.cpp',
             'source/i18n/bms.cpp',
             'source/i18n/bmsearch.cpp',
@@ skipping 735 matching lines @@
               'toolsets': ['target'],
             }, {
               'toolsets': ['host', 'target'],
             }],
           ],
         },
       ],
     }],
   ],
 }