Reuse linux's config.h to build sdch on android.

sdch/sdch.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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 35 matching lines @@
       ],
       'include_dirs': [
         'open-vcdiff/src',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'open-vcdiff/src',
         ],
       },
       'conditions': [
-        [ 'OS == "linux"', { 'include_dirs': [ 'linux' ] } ],
+        [ 'OS == "linux" or OS == "android"', { 'include_dirs': [ 'linux' ] } ],
         [ 'OS == "freebsd" or OS == "openbsd" or OS=="solaris"', { 'include_dirs': [ 'bsd' ] } ],
         [ 'OS == "mac"', { 'include_dirs': [ 'mac' ] } ],
         [ 'OS == "win"', { 'include_dirs': [ 'open-vcdiff/vsprojects' ] } ],
       ],
     },
   ],
 }