node.h: Remove a not used function prototype

* node.h (rb_node_newnode_longlife): The definition
  of this function was deleted r24490.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60265 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.h

@@ -479,7 +479,6 @@ NODE *rb_compile_string(const char*, VALUE, int);
 NODE *rb_compile_file(const char*, VALUE, int);
 
 NODE *rb_node_newnode(enum node_type,VALUE,VALUE,VALUE);
-NODE *rb_node_newnode_longlife(enum node_type,VALUE,VALUE,VALUE);
 void rb_gc_free_node(VALUE obj);
 size_t rb_node_memsize(VALUE obj);
 VALUE rb_gc_mark_node(NODE *obj);