cleanup: Add comment after every `#endif`. #4892

Job	Run time
docker-esp32	1m 23s
docker-bootstrap-node	22s
docker-clusterfuzz	1m 19s
docker-fuzzer	9s
docker-toxcore-js	1m 22s
docker-win32	15s
docker-win64	12s
docker-bootstrap-node-websocket	0s
	5m 2s

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