Some more applications

[Doug Evans]

Ben Elliston writes:
 > I know they're only small, but they might be a nice introduction to writing
 > cgen applications, plus they remove the likelihood of transcription errors:
 > 
 > 	* Generate BFD cpu-<arch> file.
 > 	* Generate a boilerplate tdep file for GDB ports.

Thought about doing cpu-arch early on.
I have mixed feelings on it.
It feels like the right thing to do [and in the end I think it is],
but ...
For one, it's really small for all the current ports
and we don't yet generate bfd files [hence lots of work for little
gain].

Dunno about tdep.