port of bc and dc

[Ewan Meadows]

> Should I also include them in the source tree as mentioned in
> the PortingHowto and create patches?

Yes please, you'll need to edit a few files to get it integrated into
the build system, I'm not sure if this information is in the wiki
(from the top of my brain):
config/config.in
config/Configure.help
user/Makefile
vendors/Nintendo/* will need to be updated using ./bulkbuild.sh -u,
which unfortunately does a make clean.

If you post the patches here, it'll save me the effort when I get
around to doing it.