HoTT doesn't depend on Stdlib #3856

Job	Run time
opam-build (supported, ubuntu-latest)	4m 34s
opam-build (latest, ubuntu-latest)	4m 37s
quick-build (dev, ubuntu-latest)	3m 27s
quick-build (latest, ubuntu-latest)	3m 30s
build (supported)	3m 43s
build (latest)	3m 47s
quick-build (supported, ubuntu-latest)	3m 29s
nix	2m 18s
build (dev, --warnings)	3m 41s
opam-build (dev, ubuntu-latest)	4m 12s
doc-coqdoc	1m 56s
doc-timing	1m 48s
coqchk (dev)	2m 26s
coqchk (latest)	2m 17s
coqchk (supported)	2m 15s
install (supported)	2m 1s
install (latest)	1m 50s
install (dev)	1m 47s
doc-alectryon	15m 59s
doc-dep-graphs	7m 42s
delete-artifacts	7s
deploy-doc	0s
	1h 17m 26s

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