Add plan 9 ape library functions to support old school system calls

These compile and actually mostly worked, though the listen is a total
hack I am hoping you will clean up. Gets a weird error on the full
make tests
cycle which I think you can fix in 30 seconds.

This is the compat stuff I think you were looking for.

We still need the translation server. But first we need to figure
out how names should look
[/dir/]tcp!host!port
or go style.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>