apache-websocket: Add recipe

The apache-websocket module is an Apache 2.x server module that may be
used to process requests using the WebSocket protocol (RFC 6455) by an
Apache 2.x server. The module consists of a plugin architecture for
handling WebSocket messaging.

Signed-off-by: Haris Okanovic <haris.okanovic@ni.com>
Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>