libaltos: Update to support Mac OS X 10.15 (catalina)

They decided to break device names reported by USB for some reason,
but at least the real names are still available under a different
name.

Also updated the Makefile-standalone to work on my current box;
presumably the next time I build this I'll have to update again...

Signed-off-by: Keith Packard <keithp@keithp.com>