re PR c++/66957 (incorrect "is protected within this context" error)

re PR c++/66957 (incorrect "is protected within this context" error)

	PR c++/66957
	* search.c (protected_accessible_p): Remove redundant access_in_type.
	Add otype parm instead of walking binfo.
	(friend_accessible_p): Check SCOPE itself.  Handle class
	templates.  Pass through otype.
	(dfs_accessible_post): Handle all accessibility cases.
	(dfs_accessible_pre): New.
	(accessible_p): Use it.  Don't check protected access here.  Pass
	decl and otype to dfs_walk.
	(member_declared_in_type, dfs_access_in_type_pre): New.
	(access_in_type): Use dfs_access_in_type_pre.
	* friend.c (add_friend): Fix multiple friends with the same name.

From-SVN: r227023