soci: fix build w/glibc-2.34
soci: fix build w/glibc-2.34

We don't run the tests and I didn't manage to get them running
trivially, so let's disable them. This not only speeds up
compilation-time, but also fixes the build for glibc 2.34.

Failing Hydra build: https://hydra.nixos.org/build/163952252

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs