Compilation Fix
Compilation Fix

Conditionnal compilation around use of ws_client3_data. It is defined
only in case of  USE_WEBSOCKET

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver