Hadrian: `--configure` is broken

On clean HEAD:

> ./hadrian/build.stack.sh -c -j --flavour=quick
Build system error - indirect recursion detected:
  Key value 1:  OracleQ (KeyValue ("hadrian/cfg/system.config","cross-compiling"))
  Key value 2:  hadrian/cfg/system.config
  Key value 3:  hadrian/cfg/system.config mk/config.h compiler/ghc.cabal rts/rts.cabal
  Key value 4:  OracleQ (KeyValue ("hadrian/cfg/system.config","gmp-lib-dir"))
Rules may not be recursive

This is because of 09b88384

Patch coming.

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