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Don't let RUBY_YJIT_ENABLE turn the interp executable into YJIT #2101

Job	Run time
benchmark-ractor-only (head)	37s
benchmark-ractor (head)	6m 37s
benchmark-graph	46s
benchmark-default (ruby)	12m 29s
test (head)	46s
benchmark-run-once	1m 24s
test (ruby)	54s
benchmark-default (head)	13m 21s
test (truffleruby)	1m 43s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 36s
all-tests	4s
	52m 17s