Add th-orphans to th-dlls test #2679

Job	Run time
cabal	9s
cabal-doExactConfig	9s
check-materialization-concurrency	19s
build-extra-hackages	6s
check-path-support	5s
closure-size	7s
docs	20s
haskell-nix-roots-do-not-require-IFDs	8s
hix	26s
hix-cabal	11s
hydra-ifdLevel-2	2m 29s
hydra-ifdLevel-0-and-1	2m 23s
hydra-ifdLevel-3	6m 59s
hydra-without-remote-builders-ghc8107	36s
hydra-without-remote-builders-ghc9101	25s
maintainer-scripts	7s
multi-target	32s
nix-build	26s
nix-tools	11s
plan-extra-hackages	5s
runghc	7s
shellFor-hoogle	7s
shellFor-multiple-package	11s
shellFor-not-depends	12s
shellFor-single-package	14s
tests-benchmarks	12s
update-docs	8s
unit-tests	4s
	17m 28s

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