Move to use bsdiff/ prefix in includes.

The bspatch.h headers are now under a "bsdiff/" directory.

Change-Id: Ica2935e4163f617d60df1bc0846978b0e1a59f46
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index 51967b3..ab0a99e 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -34,7 +34,7 @@
 #include <base/strings/stringprintf.h>
 #include <brillo/data_encoding.h>
 #include <brillo/make_unique_ptr.h>
-#include <bspatch.h>
+#include <bsdiff/bspatch.h>
 #include <google/protobuf/repeated_field.h>
 
 #include "update_engine/common/constants.h"