SocketHelpers: ping, fix build for generic M4 #1288

Job	Run time
compile-examples (arduino:mbed:nano33ble, nano33ble)	7m 4s
compile-examples (arduino:mbed:envie_m7, envie_m7)	27m 0s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, envie_m7_core_cm4)	5m 43s
compile-examples (arduino:mbed:nanorp2040connect, nanorp2040connect)	12m 19s
compile-examples (arduino:mbed:nicla_sense, nicla_sense)	13m 7s
compile-examples (arduino:mbed:nicla_vision, nicla_vision)	16m 7s
compile-examples (arduino:mbed:opta, opta)	18m 14s
compile-examples (arduino:mbed:giga, giga)	27m 21s
compile-examples (arduino:mbed:nicla_voice, nicla_voice)	5m 24s
compile-examples (arduino:mbed:edge_control, edge_control)	5m 18s
	2h 17m 37s

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