made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/indent/dune.vim

@@ -0,0 +1,16 @@
+" Vim indent file
+" Language: dune
+" Maintainers:  Markus Mottl         <markus.mottl@gmail.com>
+" URL:          https://github.com/ocaml/vim-ocaml
+" Last Change:  2021 Jan 01
+"               2023 Aug 28 by Vim Project (undo_indent)
+
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+" dune format-dune-file uses 1 space to indent
+setlocal softtabstop=1 shiftwidth=1 expandtab
+
+let b:undo_indent = "setl et< sts< sw<"