[tracking] test 64-bit profile builds

This is a tracking issue for testing a 64-bit version of Proteus on Linux.

We'll likely rebase/squash the majority of the work in this branch, so feel free to make partially-working commits into this while we hack on this.

You will need to go into your `stack` directory and merge in the pull requests from https://github.com/hashdist/hashstack2/pull/107 to get this working.  I suppose I could just add this to the Makefile, but I need to leave at least a little manual work in here :)