Rename OS(UNIX) to OS(POSIX)

Source/wtf/DataLog.cpp

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "DataLog.h"
 #include <stdarg.h>
 #include "wtf/FilePrintStream.h"
 #include "wtf/WTFThreadData.h"
 #include "wtf/Threading.h"
 
-#if OS(UNIX)
+#if OS(POSIX)
 #include <unistd.h>
 #endif
 
 #define DATA_LOG_TO_FILE 0
 
 // Uncomment to force logging to the given file regardless of what the environment variable says. Note that
 // we will append ".<pid>.txt" where <pid> is the PID.
 
 // This path won't work on Windows, make sure to change to something like C:\\Users\\<more path>\\log.txt.
 #define DATA_LOG_FILENAME "/tmp/WTFLog"
@@ skipping 59 matching lines @@
     va_end(argList);
 }
 
 void dataLogFString(const char* str)
 {
     dataFile().printf("%s", str);
 }
 
 } // namespace WTF