Ivan Grokhotkov f8750eb58d lwip: add compatibility headers for sntp.h and esp_ping.h
Before LwIP was moved into a submodule, sntp and esp_ping were
available as the following includes:

#include "apps/sntp/sntp.h"
#include "esp_ping.h"

This commit makes header files available at the old location, and adds
a deprecation warning for sntp.h.

Closes https://github.com/espressif/esp-idf/issues/2392
2018-09-21 14:09:37 +08:00
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