esp8266/etshal: delete incorrect function prototypes
esp8266/etshal: delete incorrect function prototypes

these are function prototypes not used in circuitpython.  The
declarations began to conflict with ones in the upstream SDK
at some point, so delete them.

adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython