Add th-orphans to th-dlls test #2676

Job	Run time
cabal-doExactConfig	13s
cabal	9s
build-extra-hackages	10s
check-materialization-concurrency	20s
check-path-support	9s
closure-size	3s
docs	17s
hix	28s
haskell-nix-roots-do-not-require-IFDs	12s
hix-cabal	11s
hydra-ifdLevel-0-and-1	2m 29s
hydra-ifdLevel-3	22m 59s
hydra-ifdLevel-2	2m 33s
hydra-without-remote-builders-ghc8107	36s
hydra-without-remote-builders-ghc9101	29s
maintainer-scripts	8s
nix-build	1m 1s
multi-target	30s
nix-tools	10s
plan-extra-hackages	5s
runghc	6s
shellFor-hoogle	8s
shellFor-multiple-package	10s
shellFor-not-depends	12s
shellFor-single-package	14s
tests-benchmarks	7s
unit-tests	5s
update-docs	5s
	34m 19s

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