runtime(forth): Fix :unlet error in ftplugin (#13090)

Commit: 
https://github.com/vim/vim/commit/c1f8bb37c6a8e0babc2a41f16860763b57c23fa1
Author: dkearns <dougkea...@gmail.com>
Date:   Sat Sep 16 00:47:06 2023 +1000

    runtime(forth): Fix :unlet error in ftplugin 
(https://github.com/vim/vim/issues/13090)
    
    Fixes https://github.com/vim/vim/issues/13089.
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/forth.vim b/runtime/ftplugin/forth.vim
index 5343784a2..d28c8484e 100644
--- a/runtime/ftplugin/forth.vim
+++ b/runtime/ftplugin/forth.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin
 " Language:    Forth
 " Maintainer:  Johan Kotlinski <kotlin...@gmail.com>
-" Last Change: 2023 Aug 08
+" Last Change: 2023 Sep 15
 " URL:         https://github.com/jkotlinski/forth.vim
 
 if exists("b:did_ftplugin")
@@ -58,6 +58,7 @@ if exists("loaded_matchit") && !exists("b:match_words")
   let b:match_ignorecase = 1
   let b:match_words = s:matchit_patterns[1:]->join(',')
   let b:undo_ftplugin ..= "| unlet! b:match_ignorecase b:match_words"
+  unlet s:matchit_patterns
 endif
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
@@ -68,4 +69,4 @@ endif
 
 let &cpo = s:cpo_save
 unlet s:cpo_save
-unlet s:define_patterns s:include_patterns s:matchit_patterns
+unlet s:define_patterns s:include_patterns

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