patch 8.2.5081: autocmd test fails on MS-Windows

Problem:    Autocmd test fails on MS-Windows.
Solution:   Set shellslash to get forward slashes.

Author: brammool

src/testdir/test_autocmd.vim

@@ -2108,12 +2108,15 @@ function Test_dirchanged_global()
   exe 'lcd ' .. fnameescape(s:dir_bar)
   call assert_equal(expected, s:li)
 
+  let save_shellslash = &shellslash
+  set shellslash
   exe 'cd ' .. s:dir_foo
   exe 'cd ' .. s:dir_bar
   autocmd! test_dirchanged DirChanged global let g:result = expand("<afile>")
   cd -
   call assert_equal(s:dir_foo, g:result)
 
+  let &shellslash = save_shellslash
   call s:After_test_dirchanged()
 endfunc
 

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5081,
 /**/
     5080,
 /**/