[BUILD] missing #ifndef in ebsttree.h

ebtree/ebsttree.h

@@ -20,6 +20,9 @@
 
 /* These functions and macros rely on Multi-Byte nodes */
 
+#ifndef _EBSTTREE_H
+#define _EBSTTREE_H
+
 #include "ebtree.h"
 #include "ebmbtree.h"
 
@@ -256,3 +259,5 @@ __ebst_insert(struct eb_root *root, struct ebmb_node *new)
 	return new;
 }
 
+#endif /* _EBSTTREE_H */
+