Do not use SO_REUSEADDR on Window by default

[eao197]

RESTinio sets SO_REUSEADDR option in settings by default. But on Windows SO_REUSEADDR works differently than on Linux (and other Unixes AFAIK): on Windows SO_REUSEADDR allows to run two instances of RESTinio server on the same address. For more information see, for example, this and this.

So I think wa have to change the behaviour of create_default_unique_object_instance<acceptor_option_setter_t>:

restinio/dev/restinio/settings.hpp

Lines 229 to 235 in 7994a15

	create_default_unique_object_instance< acceptor_options_setter_t >()
	{
	return std::make_unique< acceptor_options_setter_t >(
	[]( acceptor_options_t & options ){
	options.set_option( asio_ns::ip::tcp::acceptor::reuse_address( true ) );
	} );
	}

The reuse_address should not be used on Windows.