Add yasm and ffmpeg into the build tree for linux.

third_party/zlib/zlib.gyp

 # Copyright (c) 2009 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_zlib%': 0,
   },
   'conditions': [
     ['use_system_zlib==0', {
@@ skipping 40 matching lines @@
             # For contrib/minizip
             '../..',
           ],
           'direct_dependent_settings': {
             'include_dirs': [
               '.',
             ],
           },
           'conditions': [
             ['OS!="win"', {
-              'product_name': 'z',
+              'product_name': 'chrome_zlib',
               'sources!': [
                 'contrib/minizip/iowin32.c'
               ],
             }],
           ],
         },
       ],
     }, {
       'targets': [
         {
@@ skipping 24 matching lines @@
       ],
     }],
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: