test

Build the extension library only when CRuby (Fix #69) #191

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.5 / ubuntu-latest)	23s
build (2.5 / windows-latest)	1m 30s
build (2.6 / ubuntu-latest)	20s
build (2.6 / macos-latest)	37s
build (2.6 / windows-latest)	1m 29s
build (2.7 / ubuntu-latest)	20s
build (2.7 / macos-latest)	29s
build (2.7 / windows-latest)	1m 28s
build (3.0 / ubuntu-latest)	7s
build (3.0 / macos-latest)	12s
build (3.0 / windows-latest)	1m 19s
build (3.1 / ubuntu-latest)	6s
build (3.1 / macos-latest)	12s
build (3.1 / windows-latest)	1m 9s
build (3.2 / ubuntu-latest)	12s
build (3.2 / macos-latest)	11s
build (3.2 / windows-latest)	1m 22s
build (3.3 / ubuntu-latest)	10s
build (3.3 / macos-latest)	11s
build (3.3 / windows-latest)	1m 27s
build (head / ubuntu-latest)	8s
build (head / macos-latest)	13s
build (head / windows-latest)	1m 22s
build (jruby / ubuntu-latest)	33s
build (jruby / macos-latest)	1m 42s
build (jruby / windows-latest)	1m 24s
build (jruby-head / ubuntu-latest)	36s
build (jruby-head / macos-latest)	33s
build (jruby-head / windows-latest)	1m 34s
build (mswin / windows-latest)	1m 19s
	22m 40s

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