Fix unix-time in TH code when cross compiling for windows #2464

Job	Run time
cabal	25s
cabal-doExactConfig	22s
runghc	20s
unit-tests	14s
build-extra-hackages	23s
tests-benchmarks	19s
docs	53s
hix	1m 19s
maintainer-scripts	28s
multi-target	54s
plan-extra-hackages	18s
nix-build	58s
shellFor-hoogle	23s
shellFor-multiple-package	20s
shellFor-single-package	23s
shellFor-not-depends	22s
check-materialization-concurrency	20s
check-path-support	10s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	5s
hydra-ifdLevel-0-and-1	35s
hydra-ifdLevel-2	21s
hydra-ifdLevel-3-and-ghc-8-10	20s
hydra-ifdLevel-3-and-ghc-9-2	19s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	17s
update-docs	10s
hix-cabal	7s
hydra-without-remote-builders-ghc8107	51s
nix-tools	12s
hydra-without-remote-builders-ghc9101	51s
	13m 2s

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