Merge pull request #1133 from herwinw/unixsocket_pair #1662

Job	Run time
RuboCop	25s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 26s
specs (ubuntu, 3.3.0)	1m 23s
specs (macos, 3.0.6)	1m 24s
specs (macos, 3.1.4)	1m 27s
specs (macos, 3.2.2)	1m 28s
specs (macos, 3.3.0)	1m 19s
specs (windows, 3.0.6)	3m 29s
specs (windows, 3.1.4)	5m 42s
specs (windows, 3.2.2)	3m 56s
specs (windows, 3.3.0)	3m 40s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 24s
	30m 1s

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