These aren't used in the build and will bitrot badly once
changing the VFS significantly.

Eclipse recognizes .mk as a makefile, make it easier for new users to
use eclipse.

Previous commit broke the build, because I forgot to commit a file.

Just like fat the test isn't wired up yet until we have the infrastructure
for it.

Imported from prex.  Note that the test isn't wired up yet as we'll need
more infrastructure changes to run it.