Fix postgresql-libpq-configure #3117

Job	Run time
cabal	9s
cabal-doExactConfig	14s
nix-build	1m 35s
unit-tests	10s
runghc	12s
build-extra-hackages	11s
check-materialization-concurrency	23s
check-path-support	7s
closure-size	3s
docs	39s
haskell-nix-roots-do-not-require-IFDs	22s
hix	52s
hix-cabal	8s
hydra-ifdLevel-0-and-1	2m 34s
hydra-ifdLevel-2	2m 56s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9102	1m 15s
hydra-without-remote-builders-ghc967	59s
maintainer-scripts	5s
multi-target	37s
nix-tools	15s
plan-extra-hackages	5s
shellFor-hoogle	12s
shellFor-not-depends	19s
shellFor-multiple-package	15s
shellFor-single-package	23s
tests-benchmarks	7s
update-docs	6s
	45m 29s

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