lwIP 2.1.2 Lightweight IP stack

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- HOSTENT_STORAGE : netdb.c
- HTTP_DEFAULT_PORT : http_client.h
- HTTP_IS_DATA_VOLATILE : httpd.c
- HTTP_IS_HDR_VOLATILE : httpd.c
- HTTP_IS_TAG_VOLATILE : httpd_opts.h
- HTTPC_CLIENT_AGENT : http_client.c
- HTTPC_DEBUG : http_client.c
- HTTPC_DEBUG_REQUEST : http_client.c
- HTTPD_DEBUG_TIMING : httpd_opts.h
- HTTPD_ENABLE_HTTPS : httpd_opts.h
- HTTPD_FSDATA_FILE : httpd_opts.h
- HTTPD_MAX_RETRIES : httpd_opts.h
- HTTPD_POLL_INTERVAL : httpd_opts.h
- HTTPD_PRECALCULATED_CHECKSUM : httpd_opts.h
- HTTPD_SERVER_AGENT : httpd_opts.h
- HTTPD_SERVER_PORT : httpd_opts.h
- HTTPD_SERVER_PORT_HTTPS : httpd_opts.h
- HTTPD_SSI_TAG_UNKNOWN : httpd.h
- HTTPD_TCP_PRIO : httpd_opts.h
- HTTPD_USE_MEM_POOL : httpd_opts.h