Handle big endian hosts
Handle big endian hosts

The websocket_header structure was defined in little endian order. To
also handle big endian systems, also define the structure members in big
endian order and select the appropriate ones depending on the
__BYTE_ORDER__ macro.

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@digital-domain.net>

ac000/websocket_demo,ac000/websocket_demo