see if somehow a seemingly duplicate path is being added #1141

Job	Run time
initialise	3s
quick-check	5m 23s
ubuntu-bootstrap-chez	6m 49s
macos-bootstrap-chez	6m 59s
ubuntu-bootstrap-racket	13m 2s
ubuntu-self-host-previous-version	10m 11s
windows-bootstrap-chez	24m 39s
nix-bootstrap-chez	18m 57s
ubuntu-build-api	5m 17s
ubuntu-self-host-chez	10m 47s
macos-self-host-chez	15m 7s
ub-pack-test-pack	0s
ub-test-collie	0s
ub-test-elab-util	0s
ub-pack-test-lsp	0s
ub-test-frex	0s
ub-test-katla-and-html	0s
ubuntu-self-host-racket	0s
windows-self-host-racket	0s
	1h 57m 14s

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