Add th-orphans to th-dlls test #2678

Job	Run time
cabal-doExactConfig	15s
cabal	18s
runghc	7s
nix-build	1m 32s
maintainer-scripts	8s
unit-tests	5s
multi-target	38s
shellFor-hoogle	14s
shellFor-multiple-package	15s
shellFor-not-depends	11s
shellFor-single-package	18s
build-extra-hackages	7s
tests-benchmarks	8s
check-path-support	7s
check-materialization-concurrency	19s
closure-size	3s
docs	20s
hydra-ifdLevel-0-and-1	2m 36s
hix	16s
hydra-ifdLevel-2	2m 37s
hydra-ifdLevel-3	22m 47s
plan-extra-hackages	5s
update-docs	6s
haskell-nix-roots-do-not-require-IFDs	9s
hix-cabal	7s
hydra-without-remote-builders-ghc8107	1m 41s
hydra-without-remote-builders-ghc9101	1m 31s
nix-tools	11s
	37m 11s

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