wrap all FILE access to go through simple xmlwriter

wrap all FILE access to go through simple xmlwriter

2008-10-15  Tommi Komulainen  <tommi.komulainen@iki.fi>

	* tools/generate.c (xml_printf, xml_open, xml_close, xml_free):
	(write_type_name, write_type_info, write_field_info,
	write_callable_info, write_function_info, write_callback_info,
	write_struct_info, write_value_info, write_constant_value,
	write_constant_info, write_enum_info, write_signal_info,
	write_vfunc_info, write_property_info, write_object_info,
	write_interface_info, write_error_domain_info, write_union_info,
	write_repository): wrap all FILE access to go through simple xmlwriter

svn path=/trunk/; revision=712