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/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 9bc06b3..ea2237a 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -153,6 +153,7 @@
     \ 'dsl': ['file.dsl'],
     \ 'dtd': ['file.dtd'],
     \ 'dts': ['file.dts', 'file.dtsi'],
+    \ 'dune': ['jbuild', 'dune', 'dune-project', 'dune-workspace'],
     \ 'dylan': ['file.dylan'],
     \ 'dylanintr': ['file.intr'],
     \ 'dylanlid': ['file.lid'],
@@ -338,9 +339,10 @@
     \ 'nroff': ['file.tr', 'file.nr', 'file.roff', 'file.tmac', 'file.mom', 'tmac.file'],
     \ 'nsis': ['file.nsi', 'file.nsh'],
     \ 'obj': ['file.obj'],
-    \ 'ocaml': ['file.ml', 'file.mli', 'file.mll', 'file.mly', '.ocamlinit'],
+    \ 'ocaml': ['file.ml', 'file.mli', 'file.mll', 'file.mly', '.ocamlinit', 'file.mlt', 'file.mlp', 'file.mlip', 'file.mli.cppo', 'file.ml.cppo'],
     \ 'occam': ['file.occ'],
     \ 'omnimark': ['file.xom', 'file.xin'],
+    \ 'opam': ['opam', 'file.opam', 'file.opam.template'],
     \ 'openroad': ['file.or'],
     \ 'ora': ['file.ora'],
     \ 'pamconf': ['/etc/pam.conf', '/etc/pam.d/file', 'any/etc/pam.conf', 'any/etc/pam.d/file'],
@@ -414,6 +416,7 @@
     \ 'scheme': ['file.scm', 'file.ss', 'file.rkt'],
     \ 'scilab': ['file.sci', 'file.sce'],
     \ 'screen': ['.screenrc', 'screenrc'],
+    \ 'sexplib': ['file.sexp'],
     \ 'scss': ['file.scss'],
     \ 'sd': ['file.sd'],
     \ 'sdc': ['file.sdc'],
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,