- fix(esp8266):
- Adding includes for missing symbols.
- Removing unused variables.
- Skip unsupported packing pragmas.
- Add rom_functions.h for symbols that come from the ESP ROM. Add attributes on
ets_printf so GCC will check the syntax of the formatting string and types of
the arguments.
- Add ETS_GPIO_INTR_EN(DIS)ABLE macro.
- Use gpio_output_conf instead of gpio_output_set.
- fix(freertos):
- Define functions that are useful.
- Use correct printf symbols when printing.
- fix(lwip):
- Ignore the warning in sntp.
- fix(mqtt):
- `xTicksToWait` is unsigned, can't check for less than zero. Remove
unused variables.
- fix(newlib):
- `_free_r()` returns `void`, not `void *`.
- Adding includes for missing symbols.
- fix(ssl):
- Make sure functions always return a value.
Merges https://github.com/espressif/ESP8266_RTOS_SDK/pull/188
