build

sighdl: include stddef header file #3035

Job	Run time
default (gcc, release)	44s
default (clang, release)	35s
default (gcc, debug)	34s
cross (armhf)	56s
muon minimal static	29s
cross (ppc64le)	46s
default (clang, debug)	32s
make static	1m 27s
cross (s390x)	49s
build libnvme and nvme-cli separately	37s
fallback shared libraries	0s
	7m 29s

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