Add support for static nix-tools #1934

Job	Run time
cabal	3m 0s
build-extra-hackages	2m 23s
check-materialization-concurrency	23s
cabal-doExactConfig	2m 42s
check-path-support	2m 32s
closure-size	1m 23s
docs	3m 14s
haskell-nix-roots-do-not-require-IFDs	1m 31s
hix	1m 54s
hix-cabal	1m 12s
hydra-ifdLevel-0-and-1	1m 18s
hydra-ifdLevel-2	40s
hydra-ifdLevel-3-and-ghc-8-10	30s
hydra-ifdLevel-3-and-ghc-9-2	38s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	28s
hydra-without-remote-builders	2m 50s
maintainer-scripts	13s
multi-target	23s
nix-tools	10s
nix-build	2m 15s
plan-extra-hackages	14s
runghc	17s
shellFor-hoogle	23s
shellFor-multiple-package	28s
shellFor-not-depends	36s
shellFor-single-package	22s
tests-benchmarks	8s
unit-tests	25s
update-docs	11s
	32m 43s

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