Add th-orphans to th-dlls test (#2245) #2680

Job	Run time
build-extra-hackages	8s
cabal-doExactConfig	10s
cabal	11s
check-materialization-concurrency	22s
closure-size	3s
check-path-support	5s
docs	24s
haskell-nix-roots-do-not-require-IFDs	8s
hix	20s
hydra-ifdLevel-0-and-1	2m 23s
hix-cabal	6s
hydra-ifdLevel-2	2m 38s
hydra-without-remote-builders-ghc8107	33s
hydra-ifdLevel-3	7m 2s
hydra-without-remote-builders-ghc9101	29s
maintainer-scripts	11s
multi-target	32s
nix-build	28s
nix-tools	9s
plan-extra-hackages	10s
runghc	8s
shellFor-hoogle	7s
shellFor-multiple-package	10s
shellFor-not-depends	12s
shellFor-single-package	14s
tests-benchmarks	8s
unit-tests	5s
update-docs	3s
	17m 39s

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