Avoid zlib symbol conflicts in open-vcdiff

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': [
     {
       'target_name': 'sdch',
       'type': 'static_library',
+      'dependencies': [
+        '../third_party/zlib/zlib.gyp:zlib',
+      ],
       'sources': [
         'open-vcdiff/src/addrcache.cc',
-        'open-vcdiff/src/adler32.c',
         'open-vcdiff/src/blockhash.cc',
         'open-vcdiff/src/blockhash.h',
         'open-vcdiff/src/checksum.h',
         'open-vcdiff/src/codetable.cc',
         'open-vcdiff/src/codetable.h',
         'open-vcdiff/src/compile_assert.h',
         'open-vcdiff/src/decodetable.cc',
         'open-vcdiff/src/decodetable.h',
         'open-vcdiff/src/encodetable.cc',
         'open-vcdiff/src/encodetable.h',
         'open-vcdiff/src/google/output_string.h',
         'open-vcdiff/src/google/vcdecoder.h',
         'open-vcdiff/src/headerparser.cc',
         'open-vcdiff/src/headerparser.h',
         'open-vcdiff/src/instruction_map.cc',
         'open-vcdiff/src/instruction_map.h',
         'open-vcdiff/src/logging.cc',
         'open-vcdiff/src/logging.h',
         'open-vcdiff/src/rolling_hash.h',
         'open-vcdiff/src/testing.h',
         'open-vcdiff/src/varint_bigendian.cc',
         'open-vcdiff/src/varint_bigendian.h',
         'open-vcdiff/src/vcdecoder.cc',
         'open-vcdiff/src/vcdiff_defs.h',
         'open-vcdiff/src/vcdiffengine.cc',
         'open-vcdiff/src/vcdiffengine.h',
-        'open-vcdiff/src/zconf.h',
-        'open-vcdiff/src/zlib.h',
         'open-vcdiff/vsprojects/config.h',
         'open-vcdiff/vsprojects/stdint.h',
       ],
       'include_dirs': [
         'open-vcdiff/src',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'open-vcdiff/src',
         ],
       },
       'conditions': [
         [ 'OS == "linux" or OS == "android"', { 'include_dirs': [ 'linux' ] } ],
         [ 'os_bsd==1 or OS=="solaris"', { 'include_dirs': [ 'bsd' ] } ],
         [ 'OS == "mac"', { 'include_dirs': [ 'mac' ] } ],
         [ 'OS == "win"', { 'include_dirs': [ 'open-vcdiff/vsprojects' ] } ],
       ],
     },
   ],
 }