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/linematch.pro b/src/proto/linematch.pro
new file mode 100644
index 0000000..56d0037
--- /dev/null
+++ b/src/proto/linematch.pro
@@ -0,0 +1,3 @@
+/* linematch.c */
+size_t linematch_nbuffers(const mmfile_t **diff_blk, const int *diff_len, const size_t ndiffs, int **decisions, int iwhite);
+/* vim: set ft=c : */