[Apache web server] Apache webserver now available for the N800

This is probably more heavyweight than most people will need but as I needed it for my own application, here it is for anybody else who needs it. It's been built with pretty much the default configuration; more modules may be added in the future if necessary. By default, the document root is /usr/htdocs and configuration files are in /usr/conf, which has been symlinked to /etc/httpd/conf.