runtime(racket): undo some indent options only when vim9script is available 
(#13935)

Commit: 
https://github.com/vim/vim/commit/26b0176a98f88acef840d7285e967859eb746c1c
Author: D. Ben Knoble <[email protected]>
Date:   Tue Jan 30 17:32:59 2024 -0500

    runtime(racket): undo some indent options only when vim9script is available 
(https://github.com/vim/vim/issues/13935)
    
    This copies commit 64edf95 (indent: only reset some options when has
    vim9, 2024-01-30) from https://github.com/benknoble/vim-racket.
    
    Signed-off-by: D. Ben Knoble <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/indent/racket.vim b/runtime/indent/racket.vim
index 2d45d8924..bf6eeff7d 100644
--- a/runtime/indent/racket.vim
+++ b/runtime/indent/racket.vim
@@ -3,7 +3,7 @@
 " Maintainer:           D. Ben Knoble <[email protected]>
 " Previous Maintainer:  Will Langstroth <[email protected]>
 " URL:                  https://github.com/benknoble/vim-racket
-" Last Change:          2023 Jul 17
+" Last Change:          2024 Jan 30
 
 if exists("b:did_indent")
    finish
@@ -66,4 +66,4 @@ setlocal 
lispwords+=if-view,case-view,cond-view,list-view,dyn-view
 setlocal lispwords+=case/dep
 setlocal lispwords+=define/obs
 
-let b:undo_indent = "setlocal indentexpr< lisp< lispoptions< ai< si< lw<"
+let b:undo_indent = "setlocal lisp< ai< si< lw<" .. (has('vim9script') ? 
'indentexpr< lispoptions<' : '')

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