Rename z77z into maggesi

Make the "handle" of the maintainer match the name of the github account.
Also update the email address.

pkgs/development/ocaml-modules/lablgtk/2.14.0.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation (rec {
     branch = "2.14";
     platforms = ocaml.meta.platforms or [];
     maintainers = [
-      stdenv.lib.maintainers.z77z
+      stdenv.lib.maintainers.maggesi
       stdenv.lib.maintainers.roconnor
     ];
     homepage = http://wwwfun.kurims.kyoto-u.ac.jp/soft/lsl/lablgtk.html;

pkgs/development/ocaml-modules/lablgtk/default.nix

@@ -37,7 +37,7 @@ stdenv.mkDerivation {
   meta = with stdenv.lib; {
     platforms = ocaml.meta.platforms or [];
     maintainers = with maintainers; [
-      z77z roconnor vbgl
+      maggesi roconnor vbgl
     ];
     homepage = http://lablgtk.forge.ocamlcore.org/;
     description = "An OCaml interface to GTK";