updating header to not include multiboot with alloc #832

Job	Run time
build (nightly) / rust	40s
build (stable) / rust	29s
build (msrv) / rust	40s
build no_std (stable) [Windows] / rust	2m 54s
build no_std (stable) [w/o builder] / rust	11s
style (stable) / rust	16s
build no_std (stable) / rust	15s
build no_std (msrv) / rust	51s
style (msrv) / rust	20s
build no_std (nightly) / rust	17s
tests with miri (nightly) / rust	49s
style (nightly) / rust	18s
	8m 0s

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