Explicitly included sys/time.h in py_gpio.c as it broke compilation

[dubistweltmeister05]

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• Scope of the Change - An explicit mention of the library sys/time.h in py_gpio.c.
• This was needed as on the Debian-13 image for BeagleBone black, I was hit with
• the error -
• source/py_gpio.c:231:9: error: implicit declaration of function ‘gettimeofday’
• [8;;https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Warning-Options.html#index-Wimplicit-fun ction-declaration-Wimplicit-function-declaration8;;]