Make the Unix editing behavior the default

Source/config.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2013 Apple Inc.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2010, 2011 Research In Motion Limited. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 70 matching lines @@
     || OS(MACOSX)           \
     || OS(FREEBSD)          \
     || OS(LINUX)            \
     || OS(OPENBSD)          \
     || defined(unix)        \
     || defined(__unix)      \
     || defined(__unix__)
 #define WTF_OS_POSIX 1
 #endif
 
+/* There is an assumption in the project that either OS(WIN) or OS(POSIX) is set. */
+#if !OS(WIN) && !OS(POSIX)
+#error Either OS(WIN) or OS(POSIX) needs to be set.
+#endif
+
 /* Operating environments */
 
 #if OS(ANDROID)
 #define WTF_USE_LOW_QUALITY_IMAGE_INTERPOLATION 1
 #define WTF_USE_LOW_QUALITY_IMAGE_NO_JPEG_DITHERING 1
 #define WTF_USE_LOW_QUALITY_IMAGE_NO_JPEG_FANCY_UPSAMPLING 1
 #else
 #define WTF_USE_ICCJPEG 1
 #define WTF_USE_QCMSLIB 1
 #endif
@@ skipping 68 matching lines @@
 #define SKIP_STATIC_CONSTRUCTORS_ON_GCC 1
 #endif
 
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS 1
 #endif
 
 #if OS(LINUX) || OS(ANDROID)
 #define WTF_USE_HARFBUZZ 1
 #endif