[OpenAFS] Supported Platforms

[Jim Rees]

There is a list of supported platforms in the README.  If you want to know
which platforms have some support, but might not be completely working, look
in src/config to see if there is a param.h.

Architecture dependencies appear mostly in the Makefiles, lwp, afs/FOO and
rx/FOO.  For netbsd/macppc I would start with OpenBSD and FreeBSD Makefiles,
Darwin lwp, and a mix for afs and rx.

The server will be easier than the client.  If you seriously want to work on
this, move over to openafs-devel@openafs.org and let us know how it's going.