build

tree: make nvme_lookup_ctrl and nvme_ctrl_find private #3646

Job	Run time
build libnvme and nvme-cli separately	42s
muon minimal static	37s
make static	39s
cross (ppc64le)	52s
cross (s390x)	53s
libnvme (gcc, release)	41s
libnvme (clang, debug)	43s
cross (armhf)	48s
libnvme (gcc, debug)	39s
nvme-cli (gcc, release)	57s
fallback shared libraries	1m 44s
nvme-cli (gcc, debug)	47s
libnvme (clang, release)	45s
nvme-cli (clang, release)	53s
nvme-cli (clang, debug)	47s
	12m 27s

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