build

json: update nvme_dump_config to a file descriptor #3766

Job	Run time
muon minimal static	33s
cross (s390x)	43s
cross (ppc64le)	38s
fallback shared libraries	1m 32s
cross (armhf)	38s
make static	40s
nvme-cli (gcc, debug)	44s
nvme-cli (gcc, release)	54s
nvme-cli (clang, release)	54s
build libnvme and nvme-cli separately	38s
libnvme (gcc, debug)	36s
libnvme (gcc, release)	40s
libnvme (clang, debug)	39s
libnvme (clang, release)	42s
nvme-cli (clang, debug)	46s
	11m 17s

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