build

fabrics: fix concat during connect-all #3631

Job	Run time
build libnvme and nvme-cli separately	40s
muon minimal static	38s
make static	40s
cross (s390x)	47s
nvme-cli (gcc, debug)	46s
cross (armhf)	47s
cross (ppc64le)	50s
libnvme (gcc, release)	42s
libnvme (clang, release)	50s
nvme-cli (gcc, release)	52s
libnvme (clang, debug)	40s
libnvme (gcc, debug)	38s
nvme-cli (clang, release)	59s
nvme-cli (clang, debug)	48s
fallback shared libraries	0s
	10m 37s

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