patch 8.2.3399: Octave files are not recognized

Problem:    Octave files are not recognized.
Solution:   Detect Octave files. (Doug Kearns)
diff --git a/src/version.c b/src/version.c
index 732ddee..a9219db 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3399,
+/**/
     3398,
 /**/
     3397,