Fix conditional for ffmpegsumo build.

third_party/ffmpeg/ffmpeg.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.
 
 {
   'target_defaults': {
     'conditions': [
       ['OS!="linux" and OS!="freebsd"', {'sources/': [['exclude', '/linux/']]}],
       ['OS!="mac"', {'sources/': [['exclude', '/mac/']]}],
       ['OS!="win"', {'sources/': [['exclude', '/win/']]}],
@@ skipping 20 matching lines @@
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/ffmpeg',
     'asm_library': 'ffmpegasm',
   },
   'conditions': [
     # This condition is for migrating from pre-built binaries to an in-tree
     # source build.  Most of these should be removed once FFmpeg is built on
     # mac and linux.  Windows will take more work.
     #
     # TODO(ajwong): Per the comment above, reduce this conditional's size and
     # determine if in-tree build in Windows is tractable.
-    ['OS!="linux" or OS!="freebsd" or use_system_ffmpeg==0', {
+    ['(OS!="linux" and OS!="freebsd") or use_system_ffmpeg!=0', {
       'variables': {
         'target_for_binaries': 'ffmpeg_binaries',
         'ffmpeg_include_root': 'include',
       },
     },{  # else OS=="linux"
       'variables': {
         'target_for_binaries': 'ffmpegsumo_nolink',
         'ffmpeg_include_root': 'source/patched-ffmpeg-mt',
       },
       'targets': [
@@ skipping 537 matching lines @@
       ],
     },
   ],
 }
 
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