Drop unused v8threads include from platform files

src/platform-qnx.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for QNX goes here. For the POSIX-compatible
 // parts the implementation is in platform-posix.cc.
 
 #include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
@@ skipping 14 matching lines @@
 #include <strings.h>    // index
 #include <errno.h>
 #include <stdarg.h>
 #include <sys/procfs.h>
 
 #undef MAP_TYPE
 
 #include "src/v8.h"
 
 #include "src/platform.h"
-#include "src/v8threads.h"
 
 
 namespace v8 {
 namespace internal {
 
 // 0 is never a valid thread id on Qnx since tids and pids share a
 // name space and pid 0 is reserved (see man 2 kill).
 static const pthread_t kNoThread = (pthread_t) 0;
 
 
@@ skipping 322 matching lines @@
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   return false;
 }
 
 } }  // namespace v8::internal