Add support for static nix-tools #1984

Job	Run time
cabal	46s
cabal-doExactConfig	39s
nix-build	3m 46s
runghc	41s
unit-tests	2m 1s
build-extra-hackages	37s
docs	1m 23s
hix	1m 29s
hydra-ifdLevel-0-and-1	1m 33s
maintainer-scripts	53s
multi-target	1m 22s
plan-extra-hackages	7s
shellFor-multiple-package	37s
shellFor-hoogle	1m 6s
shellFor-not-depends	10s
shellFor-single-package	14s
tests-benchmarks	6s
check-materialization-concurrency	19s
check-path-support	12s
closure-size	10s
haskell-nix-roots-do-not-require-IFDs	7s
hix-cabal	2m 51s
hydra-ifdLevel-2	6s
hydra-ifdLevel-3-and-ghc-8-10	14s
hydra-ifdLevel-3-and-ghc-9-2	16s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	11s
hydra-without-remote-builders	50s
nix-tools	1m 23s
update-docs	5s
	24m 14s

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