Frigate: find a different solution for evaluating circuits

[gutjuri]

As Frigate lacks a way to execute the circuits it generates, an additional tool for execution is required. Currently, we use a Semi-Honest-BMR implementation found here: https://github.com/cryptobiu/Semi-Honest-BMR

However, this project has not been updated in >7 years and does not compile under Ubuntu >18.04 (see this issue: cryptobiu/Semi-Honest-BMR#2).
As we aim to keep the provided MPC-examples compatible with current OSes, some action is needed:
Either, we need to fix the build process of the Semi-Honest-BMR implementation on recent OSes, or move to a different tool for executing circuits compiled by Frigate.