Bug#670828: crosshurd fails because diff package doesn't exist, it's diffutils

[Miguel Figueiredo <elmig@debianpt.org>]

Package: crosshurd
Version: 1.7.43

crosshurd fails when downloading packges as the diff packages is not 
available.
diff is provided by package diffutils.

on packages/common replacing diff by diffutils fixes it.

--
Melhores cumprimentos/Best regards,

Miguel Figueiredo