Merge pull request #2055 from ruby/skip-pty-test-windows #5472

Job	Run time
test (3.1, test)	40s
test (3.2, test)	2m 8s
test (3.3, test)	2m 22s
test (head, test)	2m 8s
test (head, stdlib_test rubocop)	2m 14s
test (3.3, stdlib_test)	2m 8s
test (3.3, test, --enable-frozen-string-literal)	2m 32s
test (3.3, stdlib_test, --enable-frozen-string-literal)	2m 7s
test (3.3, lexer compile confirm_lexer)	3m 13s
test (3.3, rubocop validate test_doc build test_generate_stdlib raap)	2m 38s
test (3.3, typecheck_test)	1m 3s
	23m 13s

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