Fix the inadyn port.

1. It was defining TARGET_ARCH as the name of the OS, which is non-standard and clashes with the definition in FreeBSD.
2. It was applying a lot of ad hoc logic for installing files.

It's essentially a dead project, so it's better to provide a simple, homegrown Makefile than it is to fix the port to do something sane.

Submitted by: gcooper