patch 9.1.1009: diff feature can be improved

Problem:  diff feature can be improved
Solution: include the linematch diff alignment algorithm
          (Jonathon)

closes: #9661

Signed-off-by: Jonathon <jonathonwhite@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto.h b/src/proto.h
index 94e34b0..091e093 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -74,6 +74,7 @@
 # include "debugger.pro"
 # include "dict.pro"
 # include "diff.pro"
+# include "linematch.pro"
 # include "digraph.pro"
 # include "drawline.pro"
 # include "drawscreen.pro"