The attached patch updates to guile-bytestructures 2.0.2.

I am not sure if the other previously suggested changes are still
needed; I did successfully build most of the packages listed by "guix
refresh --list-dependent" other than guix-jupyter... though I only
tested on x86_64. Hopefully QA picks this up and gives us better
information.

FWIW, the updated guile-bytestructures seems to work fine in Debian. :)

live well,
  vagrant