test

A workaround for JRuby to check for the target OS (Fix #69) #188

Job	Run time
ruby-versions / Generate Ruby versions	1s
build (2.5 / ubuntu-latest)	24s
build (2.5 / windows-latest)	1m 25s
build (2.6 / ubuntu-latest)	25s
build (2.6 / macos-latest)	40s
build (2.6 / windows-latest)	1m 24s
build (2.7 / ubuntu-latest)	21s
build (2.7 / macos-latest)	30s
build (2.7 / windows-latest)	1m 25s
build (3.0 / ubuntu-latest)	7s
build (3.0 / macos-latest)	13s
build (3.0 / windows-latest)	57s
build (3.1 / ubuntu-latest)	7s
build (3.1 / macos-latest)	13s
build (3.1 / windows-latest)	1m 5s
build (3.2 / ubuntu-latest)	13s
build (3.2 / macos-latest)	12s
build (3.2 / windows-latest)	1m 22s
build (3.3 / ubuntu-latest)	11s
build (3.3 / macos-latest)	11s
build (3.3 / windows-latest)	1m 24s
build (head / ubuntu-latest)	8s
build (head / macos-latest)	13s
build (head / windows-latest)	1m 9s
build (jruby / ubuntu-latest)	35s
build (jruby / macos-latest)	1m 37s
build (jruby / windows-latest)	1m 22s
build (jruby-head / ubuntu-latest)	46s
build (jruby-head / macos-latest)	39s
build (jruby-head / windows-latest)	1m 22s
build (mswin / windows-latest)	1m 19s
	22m 0s

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