Change BUILD.gn so that minizip can be built with NaCL toolchain.

third_party/zlib/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build_overrides/build.gni")
 
 config("zlib_config") {
   include_dirs = [ "." ]
 }
 
@@ skipping 99 matching lines @@
     "contrib/minizip/zip.c",
     "contrib/minizip/zip.h",
   ]
 
   if (!is_win) {
     sources -= [
       "contrib/minizip/iowin32.c",
       "contrib/minizip/iowin32.h",
     ]
   }
-  if (is_mac || is_ios || is_android) {
+  if (is_mac || is_ios || is_android || is_nacl) {
     # Mac, Android and the BSDs don't have fopen64, ftello64, or fseeko64. We
     # use fopen, ftell, and fseek instead on these systems.
     defines = [ "USE_FILE32API" ]
   }
 
   deps = [
     ":zlib",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
@@ skipping 25 matching lines @@
   static_library("compression_utils") {
     sources = [
       "google/compression_utils.cc",
       "google/compression_utils.h",
     ]
     deps = [
       ":zlib",
     ]
   }
 }