build

sighdl: include stddef header file #3027

Job	Run time
cross (armhf)	45s
default (gcc, debug)	25s
cross (ppc64le)	41s
build libnvme and nvme-cli separately	36s
default (clang, debug)	28s
make static	1m 26s
default (clang, release)	36s
cross (s390x)	51s
default (gcc, release)	35s
muon minimal static	33s
fallback shared libraries	0s
	6m 56s

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