* include/search.h: Reinstate node_t definition.

* include/sys/cdefs.h: Remove in favor of newlib version.

winsup/cygwin/include/search.h

@@ -31,6 +31,14 @@ typedef	enum
   leaf
 } VISIT;
 
+#ifdef _SEARCH_PRIVATE
+typedef	struct node
+{
+  char *key;
+  struct node *llink, *rlink;
+} node_t;
+#endif
+
 struct hsearch_data
 {
   struct internal_head *htable;