Remove OS(QNX) support.

Source/wtf/MathExtras.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010 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 25 matching lines @@
 
 #if OS(SOLARIS)
 #include <ieeefp.h>
 #endif
 
 #if OS(OPENBSD)
 #include <sys/types.h>
 #include <machine/ieee.h>
 #endif
 
-#if OS(QNX)
-// FIXME: Look into a way to have cmath import its functions into both the standard and global
-// namespace. For now, we include math.h since the QNX cmath header only imports its functions
-// into the standard namespace.
-#include <math.h>
-#endif
-
 #ifndef M_PI
 const double piDouble = 3.14159265358979323846;
 const float piFloat = 3.14159265358979323846f;
 #else
 const double piDouble = M_PI;
 const float piFloat = static_cast<float>(M_PI);
 #endif
 
 #ifndef M_PI_2
 const double piOverTwoDouble = 1.57079632679489661923;
@@ skipping 71 matching lines @@
     return integer - num >= 0.5f ? integer - 1.0f : integer;
 }
 inline long long llround(double num) { return static_cast<long long>(round(num)); }
 inline long long llroundf(float num) { return static_cast<long long>(roundf(num)); }
 inline long lround(double num) { return static_cast<long>(round(num)); }
 inline long lroundf(float num) { return static_cast<long>(roundf(num)); }
 inline double trunc(double num) { return num > 0 ? floor(num) : ceil(num); }
 
 #endif
 
-#if COMPILER(GCC) && OS(QNX)
-// The stdlib on QNX doesn't contain long abs(long). See PR #104666.
-inline long long abs(long num) { return labs(num); }
-#endif
-
 #if OS(ANDROID) || COMPILER(MSVC)
 // ANDROID and MSVC's math.h does not currently supply log2 or log2f.
 inline double log2(double num)
 {
     // This constant is roughly M_LN2, which is not provided by default on Windows and Android.
     return log(num) / 0.693147180559945309417232121458176568;
 }
 
 inline float log2f(float num)
 {
@@ skipping 286 matching lines @@
     if (i >> 2)
         log2 += 2, i >>= 2;
     if (i >> 1)
         log2 += 1;
     return log2;
 }
 
 } // namespace WTF
 
 #endif // #ifndef WTF_MathExtras_h