vpnc: enable parallel building

Built successfully at -j48.

+2
+2
pkgs/tools/networking/vpnc/default.nix
··· 31 31 patchShebangs src/makeman.pl 32 32 ''; 33 33 34 + enableParallelBuilding = true; 35 + 34 36 meta = with lib; { 35 37 homepage = "https://davidepucci.it/doc/vpnc/"; 36 38 description = "Virtual private network (VPN) client for Cisco's VPN concentrators";