Currently bootstrapping the MMTk binding induces a dependency cycle: * The rust bits (`rts/mmtk/mmtk`) requires `_build/stage1/rts/build/include/ghcautoconf.h` due to `bindgen` * `_build/stage1/rts/build/include/ghcautoconf.h` requires that `rts` be configured, due to `hadrian/src/Rules/Generate.hs:159` * configuring `rts` requires `libCmmtk_ghc.a` due to the dependency declared in `rts/rts.cabal.in` This can be manually broken by running `rts/configure` but this is a horrible hack.