[Bug: 21.5-b28] dired *su/root@localhost* method error

[Stephen J. Turnbull]

Aidan Kehoe writes:

 >  > Bogus value for `default-process-coding-system'

GNU Emacs code (specifically, Gnus's uudecode.el) is known to *bind*
that variable to nil.  The API is broken, IIRC, there is no
process-coding-system that you can bind, and maybe there are functions
that obey it but don't provide a process-coding-system argument.