Remove OS(QNX) support.

Source/wtf/DateMath.cpp

 /*
  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2010 &yet, LLC. (nate@andyet.net)
  *
  * The Original Code is Mozilla Communicator client code, released
  * March 31, 1998.
  *
@@ skipping 84 matching lines @@
 #endif
 
 #if HAVE(SYS_TIME_H)
 #include <sys/time.h>
 #endif
 
 #if HAVE(SYS_TIMEB_H)
 #include <sys/timeb.h>
 #endif
 
-#if OS(QNX)
-// qnx6 defines timegm in nbutil.h
-#include <nbutil.h>
-#endif
-
 using namespace WTF;
 
 namespace WTF {
 
 /* Constants */
 
 static const double minutesPerDay = 24.0 * 60.0;
 static const double secondsPerDay = 24.0 * 60.0 * 60.0;
 static const double secondsPerYear = 24.0 * 60.0 * 60.0 * 365.0;
 
@@ skipping 973 matching lines @@
 
     stringBuilder.append(utcOffset > 0 ? '+' : '-');
     int absoluteUTCOffset = abs(utcOffset);
     stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset / 60));
     stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset % 60));
 
     return stringBuilder.toString();
 }
 
 } // namespace WTF