Workaround issue with $LOAD_PATH / RbConfig::CONFIG['sitelibdir'] on … #1998

Job	Run time
RuboCop	57s
specs (ubuntu, 3.2.7)	1m 29s
specs (ubuntu, 3.3.7)	1m 29s
specs (ubuntu, 3.4.2)	1m 33s
specs (macos, 3.2.7)	1m 21s
specs (macos, 3.3.7)	1m 26s
specs (macos, 3.4.2)	1m 33s
specs (windows, 3.2.7)	3m 5s
specs (windows, 3.3.7)	2m 56s
specs (windows, 3.4.2)	3m 9s
specs (ubuntu, 3.4.2, --enable-frozen-string-literal)	1m 37s
specs (ubuntu, 3.4.2, --parser=parse.y)	1m 36s
	22m 11s

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