Fix more warnings in wtf

Source/wtf/FastMalloc.cpp

 // Copyright (c) 2005, 2007, Google Inc.
 // All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2011 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:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 318 matching lines @@
 namespace WTF {
 
 #define malloc fastMalloc
 #define calloc fastCalloc
 #define free fastFree
 #define realloc fastRealloc
 
 #define MESSAGE LOG_ERROR
 #define CHECK_CONDITION ASSERT
 
+#if !OS(MACOSX)
 static const char kLLHardeningMask = 0;
+#endif
+
 template <unsigned> struct EntropySource;
 template <> struct EntropySource<4> {
     static uint32_t value()
     {
 #if OS(MACOSX)
         return arc4random();
 #else
         return static_cast<uint32_t>(static_cast<uintptr_t>(currentTime() * 10000) ^ reinterpret_cast<uintptr_t>(&kLLHardeningMask));
 #endif
     }
@@ skipping 3501 matching lines @@
 void FastMallocZone::init()
 {
     static FastMallocZone zone(pageheap, &thread_heaps, static_cast<TCMalloc_Central_FreeListPadded*>(central_cache), &span_allocator, &threadheap_allocator);
 }
 
 #endif // OS(MACOSX)
 
 } // namespace WTF
 
 #endif // FORCE_SYSTEM_MALLOC