Build WTF as dll in component build

Source/wtf/ParallelJobsLibdispatch.h

 /*
  * Copyright (C) 2011 University of Szeged
  * Copyright (C) 2011 Gabor Loki <loki@webkit.org>
  * 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.
@@ skipping 13 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ParallelJobsLibdispatch_h
 #define ParallelJobsLibdispatch_h
 
 #if ENABLE(THREADING_LIBDISPATCH)
 
 #include <dispatch/dispatch.h>
+#include "wtf/WTFExport.h"
 
 namespace WTF {
 
-class ParallelEnvironment {
+class WTF_EXPORT ParallelEnvironment {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     typedef void (*ThreadFunction)(void*);
 
     ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber)
         : m_threadFunction(threadFunction)
         , m_sizeOfParameter(sizeOfParameter)
         , m_numberOfJobs(requestedJobNumber)
     {
         // We go with the requested number of jobs. libdispatch will distribute the work optimally.
@@ skipping 16 matching lines @@
     ThreadFunction m_threadFunction;
     size_t m_sizeOfParameter;
     int m_numberOfJobs;
 };
 
 } // namespace WTF
 
 #endif // ENABLE(THREADING_LIBDISPATCH)
 
 #endif // ParallelJobsLibdispatch_h