Move non-linux specs for Rational exponents with ArgumentErrors #1849

Job	Run time
RuboCop	30s
specs (ubuntu, 3.0.6)	1m 34s
specs (ubuntu, 3.1.4)	1m 28s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 28s
specs (macos, 3.0.6)	1m 22s
specs (macos, 3.1.4)	1m 21s
specs (macos, 3.2.2)	1m 10s
specs (macos, 3.3.0)	1m 8s
specs (windows, 3.0.6)	3m 36s
specs (windows, 3.1.4)	4m 44s
specs (windows, 3.2.2)	5m 25s
specs (windows, 3.3.0)	4m 39s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 37s
	31m 27s

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