Modernize: use PHP_OS_FAMILY constant (follow-up) #969

Job	Run time
QuickTest: PHP latest (Linux ARM)	1m 0s
QuickTest: PHP 7.2 (Win)	57s
QuickTest: PHP 8.1 (Win)	57s
QuickTest: PHP 7.2 (Linux ARM)	1m 45s
QuickTest: PHP 8.1 (Linux ARM)	1m 10s
QuickTest: PHP latest (Win)	57s
	6m 46s

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