runtime(dosini): save and restore cpo value in syntax script

Commit dd0ad25  introduced
line-continuation. However, to make sure this does not cause an error
when Vim is run in compatible mode, we need to set compatibility mode
temporarily and reset it back when finished reading the file.

This fixes: https://groups.google.com/g/vim_use/c/9zccgo_RIqM/m/xlUmhBktBgAJ

Signed-off-by: Christian Brabandt <[email protected]>

Author: chrisbra

runtime/syntax/dosini.vim

@@ -6,14 +6,18 @@
 " Current Maintainer:     Hong Xu <[email protected]>
 " Homepage:               http://www.vim.org/scripts/script.php?script_id=3747
 " Repository:             https://github.com/xuhdev/syntax-dosini.vim
-" Last Change:            2023 Jun 27
+" Last Change:            2023 Aug 20
 
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
   finish
 endif
 
+" using of line-continuation requires cpo&vim
+let s:cpo_save = &cpo
+set cpo&vim
+
 " shut case off
 syn case ignore
 
@@ -39,4 +43,7 @@ hi def link dosiniValue    String
 
 let b:current_syntax = "dosini"
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
 " vim: sts=2 sw=2 et