PR c++/13157
	* name-lookup.c (lookup_using_namespace): Remove spacesp
	parameter.
	(unqualified_namespace_lookup): Likewise.
	(lookup_qualified_name): Adjust accordingly.
	(lookup_name_real): Likewise.
	(lookup_arg_dependent): Do not eliminate the namespace of the
	functions found by unqualified name lookup unless that is the
	current namespace.

	PR c++/13157
	* g++.dg/template/koenig3.C: New test.

From-SVN: r75416