clean up quickfix.vim

src/testdir/test_quickfix.vim

@@ -8,19 +8,6 @@ source screendump.vim
 
 set encoding=utf-8
 
-function Kill_Xtest_stable_xxd()
-  if !empty(glob('Xtest_stable_xxd.txt', v:false, v:true))
-    call add(v:errors, "Xtest_stable_xxd.txt exists when it shouldn't, trying to delete it!")
-    call delete('Xtest_stable_xxd.txt')
-    if !empty(glob('Xtest_stable_xxd.txt', v:false, v:true))
-      call add(v:errors, "Xtest_stable_xxd.txt still exists after trying to delete it!")
-      if has('unix')
-        call system('rm -rf  Xtest_stable_xxd.txt')
-      endif
-    endif
-  endif
-endfunc
-
 func s:setup_commands(cchar)
   if a:cchar == 'c'
     command! -nargs=* -bang Xlist <mods>clist<bang> <args>
@@ -4268,7 +4255,6 @@ endfunc
 
 " The following test used to crash Vim
 func Test_lvimgrep_crash()
-  call Kill_Xtest_stable_xxd()
   sv Xtest
   augroup QF_Test
     au!