build

sighdl: include stddef header file #3028

Job	Run time
cross (s390x)	42s
cross (armhf)	41s
default (clang, release)	31s
cross (ppc64le)	42s
muon minimal static	29s
default (gcc, debug)	25s
default (clang, debug)	27s
default (gcc, release)	34s
build libnvme and nvme-cli separately	40s
make static	1m 31s
fallback shared libraries	-1s
	6m 41s

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