xdiff: reference util.h in parent directory Although CMake will correctly configure include directories for us, some people may use their own build system, and we should reference `util.h` based on where it actually lives.
diff --git a/src/xdiff/xdiff.h b/src/xdiff/xdiff.h
index db5d598..f08f72e 100644
--- a/src/xdiff/xdiff.h
+++ b/src/xdiff/xdiff.h
@@ -20,7 +20,7 @@
*
*/
-#include "util.h"
+#include "../util.h"
#if !defined(XDIFF_H)
#define XDIFF_H