Patches for 9.12 for reinstallable libraries to build #3442

Job	Run time
nix-build	2m 49s
runghc	27s
plan-extra-hackages	16s
unit-tests	13s
cabal-doExactConfig	23s
multi-target	1m 30s
tests-benchmarks	14s
cabal	15s
shellFor-single-package	51s
shellFor-hoogle	21s
maintainer-scripts	10s
shellFor-multiple-package	22s
shellFor-not-depends	29s
docs	1h 28m 40s
hix	37s
hydra-ifdLevel-0-and-1	10m 14s
hydra-ifdLevel-2	20m 18s
build-extra-hackages	15s
check-materialization-concurrency	24s
hydra-ifdLevel-3	30m 18s
hydra-without-remote-builders-ghc9102	10s
check-nix-tools	24s
closure-size	9s
hix-cabal	14s
check-path-support	12s
hydra-without-remote-builders-ghc967	11s
update-docs	11s
haskell-nix-roots-do-not-require-IFDs	21s
	2h 40m 58s

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