eresi: init at 0.83-a3-phoenix

While I'm not sure whether it's suitable for my tasks it might be useful
for others doing reverse engineering, so I decided to package it.

The software seems to have stalled development since a while but became
active again recently, so hopefully some of the issues with packaging
will be fixed and they might want to move away from their handwritten
configure script.

I've tested the package on both i686-linux and x86_64-linux, however the
automated test suite seems to be broken upstream at the moment so I
didn't set doCheck to true, but once this is fixed, we can enable them
in a future update.

Signed-off-by: aszlig <aszlig@nix.build>