curaengine: add protobuf in buildInputs

(cherry picked from commit c14eed2ac0e6e325d9c980990e46d93826325764)

pkgs/applications/misc/curaengine/default.nix

···
-{ stdenv, fetchFromGitHub, fetchpatch, cmake, libarcus, stb }:
+{ stdenv, fetchFromGitHub, fetchpatch, cmake, libarcus, stb, protobuf }:
 
 stdenv.mkDerivation rec {
   name = "curaengine-${version}";
···
   };
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ libarcus stb ];
+  buildInputs = [ libarcus stb protobuf ];
 
   cmakeFlags = [ "-DCURA_ENGINE_VERSION=${version}" ];