patch 8.2.1078: highlight and match functionality together in one file

Problem:    Highlight and match functionality together in one file.
Solution:   Move match functionality to a separate file. (Yegappan Lakshmanan,
            closes #6352)
diff --git a/src/proto.h b/src/proto.h
index eec7ad5..8c768fc 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -104,6 +104,7 @@
 # include "main.pro"
 # include "map.pro"
 # include "mark.pro"
+# include "match.pro"
 # include "memfile.pro"
 # include "memline.pro"
 # ifdef FEAT_MENU