patch 8.2.2258: not all OCaml related files are detected

Problem:    Not all OCaml related files are detected.
Solution:   Update OCaml file type detection.  (Markus Mottl, closes #7590)
diff --git a/src/version.c b/src/version.c
index f5d57e2..92d4573 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2258,
+/**/
     2257,
 /**/
     2256,