[Vala] libgda-4.0 vapi updates

[Daniel Espinosa <esodan gmail com>]

This patch updates libgda-4.0 vapi file. It uses lastest Gda-4.0.gir data
and API additions to 4.2.x versions.

If you are planning to switch libgda-4.0 to GIR, you'll need the following
metadata and replace manually in generated libgda-4.0.vapi the "xml"
namspace to "Xml". And the latest version of Gda with the annotations I
added.

// Vala GIR metadata to create Bindings for libgda-4.0
Gda cheader_filename="libgda/libgda.h"
Error skip
SList skip
ValueList type="GLib.List<GLib.Value>"
ServerProviderMeta skip
ServerProviderXa skip
// libxml2: replace xml.NodePtr by xml.Node* used by Vala bindings
global::xml name="Xml"
Set.new_from_spec_node.xml_spec type="xml.Node*"
DataModel.add_data_from_xml_node.node type="xml.Node*"
utility_data_model_dump_data_to_xml.parent type="xml.Node*"
utility_holder_load_attributes.node type="xml.Node*"
value_new_from_xml.node type="xml.Node*"
DataModelImport.new_xml_node.node type="xml.Node*"
ServerOperation.load_data_from_xml.node type="xml.Node*"

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