patch 9.0.0663: tests check for +cmdwin feature which is always present

Problem:    Tests check for +cmdwin feature which is always present.
Solution:   Remove the checks. (closes #11287)

src/testdir/test_arglist.vim

@@ -587,8 +587,6 @@ endfunc
 
 " Test for ":all" not working when in the cmdline window
 func Test_all_not_allowed_from_cmdwin()
-  CheckFeature cmdwin
-
   au BufEnter * all
   next x
   " Use try/catch here, somehow assert_fails() doesn't work on MS-Windows

src/testdir/test_autocmd.vim

@@ -2778,7 +2778,6 @@ endfunc
 
 func Test_autocmd_CmdWinEnter()
   CheckRunVimInTerminal
-  CheckFeature cmdwin
 
   let lines =<< trim END
     augroup vimHints | au! | augroup END
@@ -3418,7 +3417,6 @@ func Test_mode_changes()
     call assert_equal(5, g:nori_to_any)
   endif
 
-  if has('cmdwin')
   let g:n_to_c = 0
   au ModeChanged n:c let g:n_to_c += 1
   let g:c_to_n = 0
@@ -3430,7 +3428,6 @@ func Test_mode_changes()
   call assert_equal(2, g:c_to_n)
   unlet g:n_to_c
   unlet g:c_to_n
-  endif
 
   au! ModeChanged
   delfunc TestMode

src/testdir/test_cmdwin.vim

@@ -1,8 +1,6 @@
 " Tests for editing the command line.
 
 source check.vim
-CheckFeature cmdwin
-
 source screendump.vim
 
 func Test_getcmdwintype()

src/testdir/test_tabpage.vim

@@ -617,8 +617,6 @@ endfunc
 
 " Test for closing the tab page from a command window
 func Test_tabpage_close_cmdwin()
-  CheckFeature cmdwin
-
   tabnew
   call feedkeys("q/:tabclose\<CR>\<Esc>", 'xt')
   call assert_equal(2, tabpagenr('$'))

src/testdir/test_termcodes.vim

@@ -367,8 +367,6 @@ endfunc
 
 " Test for using the mouse to increase the height of the cmdline window
 func Test_mouse_cmdwin_resize()
-  CheckFeature cmdwin
-
   let save_mouse = &mouse
   let save_term = &term
   let save_ttymouse = &ttymouse

src/testdir/test_window_cmd.vim

@@ -20,8 +20,6 @@ func Test_window_cmd_ls0_with_split()
 endfunc
 
 func Test_window_cmd_cmdwin_with_vsp()
-  CheckFeature cmdwin
-
   let efmt = 'Expected 0 but got %d (in ls=%d, %s window)'
   for v in range(0, 2)
     exec "set ls=" . v

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    663,
 /**/
     662,
 /**/