The big change here is that most of the functions in
Distribution.Types.HookedBuildInfo have to take a
PackageDescription explicitly.  I hate the new type,
so I primed these new functions, and added functions
which use 'localPkgDescr'.  Presently those have WARNINGs
attached to them so people don't accidentally use them;
once we fix 'HookedBuildInfo' we can change this.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>