Drop unused v8threads include from platform files

src/platform-solaris.cc

 // Copyright 2012 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 Solaris 10 goes here. For the POSIX-compatible
 // parts, the implementation is in platform-posix.cc.
 
 #ifdef __sparc
 # error "V8 does not support the SPARC CPU architecture."
 #endif
@@ skipping 11 matching lines @@
 #include <ieeefp.h>  // finite()
 #include <signal.h>  // sigemptyset(), etc
 #include <sys/regset.h>
 
 
 #undef MAP_TYPE
 
 #include "src/v8.h"
 
 #include "src/platform.h"
-#include "src/v8threads.h"
 
 
 // It seems there is a bug in some Solaris distributions (experienced in
 // SunOS 5.10 Generic_141445-09) which make it difficult or impossible to
 // access signbit() despite the availability of other C99 math functions.
 #ifndef signbit
 namespace std {
 // Test sign - usually defined in math.h
 int signbit(double x) {
   // We need to take care of the special case of both positive and negative
@@ skipping 268 matching lines @@
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   // TODO(alph): implement for the platform.
   return false;
 }
 
 } }  // namespace v8::internal