refactor: most preparation for -DLWS_ROLE_H1=0

CMakeLists.txt

lib/context.c

lib/libwebsockets.c

lib/output.c

lib/private-libwebsockets.h

lib/roles/cgi/cgi-server.c

lib/roles/cgi/ops-cgi.c

lib/roles/h1/ops-h1.c

lib/roles/h2/ops-h2.c

lib/roles/http/client/client-handshake.c

lib/roles/http/client/client.c

lib/roles/http/header.c

lib/roles/http/private.h

lib/roles/http/server/access-log.c

lib/roles/http/server/parsers.c

lib/roles/http/server/server.c

lib/roles/ws/private.h

lib/service.c

lib/tls/openssl/openssl-client.c

...al-examples/client-server/minimal-ws-proxy/CMakeLists.txt