gcc- format strings: debug and extra plugins

lib/client-parser.c

lib/client.c

lib/context.c

lib/extension-permessage-deflate.c

lib/handshake.c

lib/lejp-conf.c

lib/libwebsockets.c

lib/output.c

lib/pollfd.c

lib/server.c

lib/ssl-server.c

plugins/generic-sessions/handlers.c

plugins/generic-sessions/protocol_generic_sessions.c

plugins/generic-sessions/protocol_lws_messageboard.c

plugins/protocol_client_loopback_test.c

test-server/test-echo.c

test-server/test-server-http.c