build

nvme: add fallback support for block vs char device to flush command #3490

Job	Run time
default (clang, debug)	45s
default (gcc, release)	51s
default (clang, release)	59s
cross (s390x)	45s
cross (armhf)	42s
cross (ppc64le)	43s
default (gcc, debug)	44s
build libnvme and nvme-cli separately	45s
muon minimal static	33s
make static	38s
fallback shared libraries	1m 25s
	8m 50s

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