build

meson: build libnvme directly instead of as a subproject #3514

Job	Run time
nvme-cli (gcc, debug)	44s
nvme-cli (clang, release)	53s
nvme-cli (clang, debug)	48s
libnvme (clang, debug)	39s
libnvme (gcc, debug)	38s
libnvme (clang, release)	49s
libnvme (gcc, release)	40s
cross (ppc64le)	47s
cross (s390x)	45s
nvme-cli (gcc, release)	52s
muon minimal static	35s
cross (armhf)	51s
make static	38s
build libnvme and nvme-cli separately	41s
fallback shared libraries	-1s
	10m 19s

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