replace platform conditions with os_posix and os_bsd where applicable

third_party/libjingle/libjingle.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': {
     'no_libjingle_logging%': 0,
   },
   'includes': [
     '../../build/win_precompile.gypi',
@@ skipping 71 matching lines @@
         ['OS=="mac"', {
           'defines': [
             'OSX',
           ],
         }],
         ['os_posix == 1', {
           'defines': [
             'POSIX',
           ],
         }],
-        ['OS=="openbsd" or OS=="freebsd"', {
+        ['os_bsd==1', {
           'defines': [
             'BSD',
           ],
         }],
         ['no_libjingle_logging==1', {
           'defines': [
             'NO_LIBJINGLE_LOGGING',
           ],
         }],
       ],
@@ skipping 23 matching lines @@
       ['OS=="mac"', {
         'defines': [
           'OSX',
         ],
       }],
       ['os_posix == 1', {
         'defines': [
           'POSIX',
         ],
       }],
-      ['OS=="openbsd" or OS=="freebsd"', {
+      ['os_bsd==1', {
         'defines': [
           'BSD',
         ],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'libjingle',
       'type': 'static_library',
@@ skipping 373 matching lines @@
         '<(DEPTH)/third_party/webrtc/modules/modules.gyp:video_render_module',
         '<(DEPTH)/third_party/webrtc/video_engine/video_engine.gyp:video_engine_core',
         '<(DEPTH)/third_party/webrtc/voice_engine/voice_engine.gyp:voice_engine_core',
         '<(DEPTH)/third_party/webrtc/system_wrappers/source/system_wrappers.gyp:system_wrappers',
         'libjingle',
         'libjingle_p2p',
       ],
     },  # target libjingle_peerconnection
   ],
 }