Build

fixes and improvements for nvme_copy_test #4419

Job	Run time
libnvme (debian, gcc, release)	52s
musl libc minimal static build on Debian	36s
cross (armhf)	46s
windows-msys2-ucrt64	1m 42s
make static	47s
muon minimal static	34s
cross (s390x)	53s
musl libc build on Alpine	40s
cross (ppc64le)	44s
build libnvme and nvme-cli separately	40s
nvme-cli (debian, clang, release)	1m 13s
nvme-cli (debian, clang, debug)	1m 4s
nvme-cli (fedora, gcc, debug)	52s
nvme-cli (fedora, clang, debug)	51s
nvme-cli (debian, gcc, debug)	57s
nvme-cli (tumbleweed, gcc, release)	1m 19s
nvme-cli (tumbleweed, clang, release)	1m 1s
nvme-cli (fedora, clang, release)	1m 0s
nvme-cli (tumbleweed, gcc, debug)	50s
nvme-cli (debian, gcc, release)	1m 1s
nvme-cli (tumbleweed, clang, debug)	51s
nvme-cli (fedora, gcc, release)	1m 4s
musl libc build on Debian	36s
fallback shared libraries	0s
	20m 53s

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