Remove circular dependency in includes
diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
index 7eadef3..ba41f72 100644
--- a/include/git2/odb_backend.h
+++ b/include/git2/odb_backend.h
@@ -28,7 +28,6 @@
#include "common.h"
#include "types.h"
#include "oid.h"
-#include "odb.h"
/**
* @file git2/backend.h