Rename the variable to not end in "_file" since that triggers gyp relative...

icu.gyp

 # Copyright (c) 2011 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%': 0,
+    'icu_use_data_file_flag%': 0,
   },
   'conditions': [
     ['use_system_icu==0', {
       'target_defaults': {
         'defines': [
           'U_USING_ICU_NAMESPACE=0',
         ],
         'conditions': [
           ['OS!="win" or component=="static_library"', {
             'defines': [
@@ skipping 37 matching lines @@
             }],
             [ 'OS != "linux" or chromeos == 1', {
               'sources!': ['linux/icudt46l_dat.S'],
             }],
             [ 'OS != "mac"', {
               'sources!': ['mac/icudt46l_dat.S'],
             }],
             [ 'chromeos != 1', {
               'sources!': ['cros/icudt46l_dat.S'],
             }],
-            [ 'OS != "win" and icu_use_data_file', {
+            [ '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', {
                     'mac_bundle_resources': [
                       'source/data/in/icudt46l.dat',
@@ skipping 432 matching lines @@
         {
           'target_name': 'icuuc',
           'type': 'none',
           'dependencies': ['system_icu'],
           'export_dependent_settings': ['system_icu'],
         },
       ],
     }],
   ],
 }