patch 8.2.2153: popupwin test for latin1 still fails sometimes

Problem:    Popupwin test for latin1 still fails sometimes.
Solution:   Wait for the "cat" command to finish.

Author: brammool

src/testdir/test_popupwin.vim

@@ -3722,6 +3722,10 @@ func Test_popupwin_latin1_encoding()
       terminal cat Xmultibyte
       call popup_create(['one', 'two', 'three', 'four'], #{line: 1, col: 10})
       redraw
+      " wait for "cat" to finish
+      while execute('ls!') !~ 'finished'
+	sleep 10m
+      endwhile
       echo "Done"
   END
   call writefile(lines, 'XtestPopupLatin')

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2153,
 /**/
     2152,
 /**/