fix compile error

deps/interval_tree/interval_tree.h

@@ -2,6 +2,11 @@
 #ifndef _LINUX_INTERVAL_TREE_H
 #define _LINUX_INTERVAL_TREE_H
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include "rbtree.h"
 #include <stdint.h>
 
@@ -30,4 +35,8 @@ extern struct interval_tree_node *
 interval_tree_iter_next(struct interval_tree_node *node,
 						uint64_t start, uint64_t last);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _LINUX_INTERVAL_TREE_H */

deps/interval_tree/interval_tree_generic.h

@@ -7,6 +7,11 @@
   include/linux/interval_tree_generic.h
 */
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include "rbtree_augmented.h"
 
 /*
@@ -195,3 +200,7 @@
 				return node;                                                 \
 		}                                                                    \
 	}
+
+#ifdef __cplusplus
+}
+#endif