arduino-core: fix 'Save as...'

Before, 'Save as..' would crash because it tries to use GSettings
to find some settings, but the GSettings schema's could not
be found in the XDG_DATA_DIRS.

Adding the glib setup hook populates GSETTINGS_SCHEMAS_PATH
so wrapGAppsHook can add it to XDG_DATA_DIRS, fixing
'Save as..'.

pkgs/development/arduino/arduino-core/default.nix

@@ -112,7 +112,10 @@ stdenv.mkDerivation rec {
   };
 
 
-  nativeBuildInputs = [ wrapGAppsHook ];
+  # the glib setup hook will populate GSETTINGS_SCHEMAS_PATH,
+  # wrapGAppHooks (among other things) adds it to XDG_DATA_DIRS
+  # so 'save as...' works:
+  nativeBuildInputs = [ glib wrapGAppsHook ];
   buildInputs = [
     jdk
     ant