unifi: LD_LIBRARY_PATH hack for embedded libsnappyjava.so, fixes #12897

nixos/modules/services/networking/unifi.nix

···
       partOf = systemdMountPoints;
       bindsTo = systemdMountPoints;
       unitConfig.RequiresMountsFor = stateDir;
+      # This a HACK to fix missing dependencies of dynamic libs extracted from jars
+      environment.LD_LIBRARY_PATH = with pkgs.stdenv; "${cc.cc}/lib";
 
       preStart = ''
         # Ensure privacy of state