Avoid using fork in Process specs #2431

Job	Run time
RuboCop	46s
specs (macos, 4.0.4)	1m 14s
specs (ubuntu, 3.3.11)	1m 33s
specs (windows, 3.4.9)	3m 21s
specs (ubuntu, 3.4.9)	1m 41s
specs (windows, 3.3.11)	2m 55s
specs (macos, 3.3.11)	1m 36s
specs (macos, 3.4.9)	1m 33s
specs (ubuntu, 4.0.4, --repeat 2)	2m 18s
specs (ubuntu, 4.0.4)	1m 30s
specs (windows, 4.0.4)	3m 39s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 32s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 31s
	26m 41s

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