Revert "vim-patch:8.1.1378: delete() can not handle a file name that looks like a pattern (#12784)"

This reverts commit 4be0e92db0.

Unfortunately, that commit stalled the Windows builds on GHA and likely requires
other patches to work properly.

test/functional/legacy/packadd_spec.lua

@@ -20,7 +20,6 @@ describe('packadd', function()
 
       func SetUp()
         let s:topdir = expand(getcwd() . '/Xdir')
-        call delete(s:topdir, 'rf')
         exe 'set packpath=' . s:topdir
         let s:plugdir = expand(s:topdir . '/pack/mine/opt/mytest')
       endfunc