Add spec for multiple -r and from both CLI and RUBYOPT #2468

Job	Run time
RuboCop	53s
specs (windows, 3.4.9)	3m 16s
specs (macos, 3.4.9)	1m 20s
specs (ubuntu, 3.3.11)	1m 27s
specs (ubuntu, 3.4.9)	1m 35s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 38s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (windows, 3.3.11)	3m 14s
specs (ubuntu, 4.0.4, --repeat 2)	1m 49s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 31s
specs (windows, 4.0.4)	3m 1s
specs (ubuntu, 4.0.4)	1m 31s
specs (macos, 4.0.4)	1m 13s
specs (macos, 3.3.11)	1m 21s
	25m 21s

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