* xml-support.c (xml_find_attribute): New.

	* xml-support.c (xml_find_attribute): New.
	(xinclude_start_include): Use it.
	* xml-support.h (xml_find_attribute): Declare.
	* memory-map.c (memory_map_start_memory)
	(memory_map_start_property): Use xml_find_attribute.
	* osdata.c (osdata_start_osdata, osdata_start_column): Use
	xml_find_attribute.
	* remote.c (start_thread): Use xml_find_attribute.
	* solib-target.c (library_list_start_segment)
	(library_list_start_section, library_list_start_library)
	(library_list_start_list): Use xml_find_attribute.
	* xml-tdesc.c (tdesc_start_target, tdesc_start_feature)
	(tdesc_start_union, tdesc_start_struct, tdesc_start_flags)
	(tdesc_start_field): Use xml_find_attribute.