Add support for static nix-tools #1992

Job	Run time
cabal	9s
nix-build	1m 30s
runghc	8s
unit-tests	12s
cabal-doExactConfig	9s
multi-target	10s
shellFor-hoogle	7s
shellFor-multiple-package	11s
shellFor-not-depends	10s
shellFor-single-package	16s
tests-benchmarks	7s
build-extra-hackages	6s
check-materialization-concurrency	19s
check-path-support	5s
closure-size	10s
docs	24s
hix	23s
haskell-nix-roots-do-not-require-IFDs	9s
hydra-ifdLevel-0-and-1	11s
hydra-ifdLevel-2	8s
hydra-ifdLevel-3-and-ghc-8-10	9s
hydra-ifdLevel-3-and-ghc-9-2	7s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	7s
hydra-without-remote-builders	6s
maintainer-scripts	10s
plan-extra-hackages	5s
update-docs	4s
hix-cabal	13s
nix-tools	9s
	6m 14s

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