[gcc r13-2356] c++: Remove unused declaration

[Marek Polacek]

https://gcc.gnu.org/g:8f8b9de6f40d057b4940776acafdeaef3e0a5eb1

commit r13-2356-g8f8b9de6f40d057b4940776acafdeaef3e0a5eb1
Author: Marek Polacek <polacek@redhat.com>
Date:   Thu Sep 1 16:02:29 2022 -0400

    c++: Remove unused declaration
    
    This declaration was added in r260905 but the function was never
    defined.
    
    gcc/cp/ChangeLog:
    
            * cp-tree.h (maybe_strip_ref_conversion): Remove.

Diff:
---
 gcc/cp/cp-tree.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index c897da204fe..c45f843825e 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -7598,7 +7598,6 @@ extern tree force_paren_expr			(tree, bool = false);
 inline tree force_paren_expr_uneval 		(tree t)
 { return force_paren_expr (t, true); }
 extern tree maybe_undo_parenthesized_ref	(tree);
-extern tree maybe_strip_ref_conversion		(tree);
 extern tree finish_non_static_data_member       (tree, tree, tree,
 						 tsubst_flags_t = tf_warning_or_error);
 extern tree begin_stmt_expr			(void);