Check for the existence of xzcat #440

Job	Run time
fedora (test:unit)	1m 25s
openbsd (test:unit)	20m 37s
fedora (test:examples)	3m 53s
test-examples (ubuntu-latest, 3.1)	2m 24s
openbsd (test:examples)	6m 59s
freebsd (test:unit)	6m 9s
test-examples (windows-latest, 3.1)	8m 1s
freebsd (test:examples)	4m 24s
test-examples (macos-13, 3.1)	6m 13s
test-unit (ubuntu-latest, 2.3)	51s
test-unit (ubuntu-latest, 2.4)	43s
test-unit (ubuntu-latest, 2.5)	46s
test-unit (ubuntu-latest, 2.6)	47s
test-unit (ubuntu-latest, 2.7)	51s
test-unit (ubuntu-latest, 3.0)	36s
test-unit (ubuntu-latest, 3.1)	42s
test-unit (ubuntu-latest, 3.2)	40s
test-unit (ubuntu-latest, 3.3)	33s
test-unit (windows-latest, 2.3)	3m 9s
test-unit (windows-latest, 2.4)	3m 41s
test-unit (windows-latest, 2.5)	3m 58s
test-unit (windows-latest, 2.6)	4m 17s
test-unit (windows-latest, 2.7)	4m 12s
test-unit (windows-latest, 3.0)	3m 24s
test-unit (windows-latest, 3.1)	3m 9s
test-unit (windows-latest, 3.2)	3m 38s
test-unit (windows-latest, 3.3)	5m 13s
test-unit (macos-latest, 2.6)	56s
test-unit (macos-latest, 2.7)	44s
test-unit (macos-latest, 3.0)	2m 40s
test-unit (macos-latest, 3.1)	32s
test-unit (macos-latest, 3.2)	37s
test-unit (macos-latest, 3.3)	35s
	1h 47m 19s

Provide feedback