darcs patch: If "Setup configure" can't satisfy deps set buildable=...

Wed Apr 25 12:33:09 BST 2007 Ian Lynagh * If "Setup configure" can't satisfy deps set buildable=False rather than failing Before there was an odd inconsistency, where ./configure scripts would (on failure) set buildable=False in <package>.buildinfo and return successfully, but if "Setup configure" itself failed due to missing build-deps then it would just exit unsuccessfully. This patch, based on a suggestion from Claus Reinke, makes "Setup configure" behave like ./configure. writeHookedBuildInfo is a bit of a misnomer for this use, but it'll do what we need.