framac: Update to GTK 3

lablgtk2 depends on libglade, which is being removed.
This will result in partial gui since ocamlgraph has not been ported to GTK 3:
https://github.com/backtracking/ocamlgraph/issues/87

pkgs/development/tools/analysis/frama-c/default.nix

@@ -44,8 +44,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoconf wrapGAppsHook ];
 
   buildInputs = with ocamlPackages; [
-    ncurses ocaml findlib ltl2ba ocamlgraph ocamlgraph_gtk yojson menhirLib camlzip
-    lablgtk coq graphviz zarith apron why3 mlgmpidl doxygen
+    ncurses ocaml findlib ltl2ba ocamlgraph yojson menhirLib camlzip
+    lablgtk3 lablgtk3-sourceview3 coq graphviz zarith apron why3 mlgmpidl doxygen
     gdk-pixbuf
   ];