miniblink修复一处使用vc6crt导致的v8执行不正常问题

原因是一个js里，用createelement('script')方式加载了一段字符串，字符串里有%取模操作。

最后发现，是v8::internal::compiler::OperationTyper::NumberModulus这里执行这个取模操作的，

里面用到了std::abs。

miniblink里实现的abs有点问题，没实现double类型，所以导致计算出错。

下面是堆栈：

v8::internal::compiler::RangeType::Limits::Limits v8::internal::compiler::Type::Overlap v8::internal::compiler::Type::Maybe v8::internal::compiler::OperationTyper::NumberModulus v8::internal::compiler::Typer::Visitor::JSModulusTyper v8::internal::compiler::Typer::Visitor::TypeBinaryOp v8::internal::compiler::Typer::Visitor::Reduce v8::internal::compiler::GraphReducer::Reduce v8::internal::compiler::GraphReducer::ReduceTop v8::internal::compiler::GraphReducer::ReduceNode v8::internal::compiler::GraphReducer::ReduceGraph v8::internal::compiler::Typer::Run v8::internal::compiler::TyperPhase::Run v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler v8::internal::compiler::PipelineImpl::CreateGraph v8::internal::compiler::PipelineCompilationJob::PrepareJobImpl v8::internal::CompilationJob::PrepareJob v8::internal::`anonymous namespace'::GetOptimizedCodeLater v8::internal::`anonymous namespace'::GetOptimizedCode v8::internal::Compiler::CompileOptimized v8::internal::__RT_impl_Runtime_CompileOptimized_Concurrent