patch 8.2.4412: translation cleanup script does not remove empty lines at end

Problem:    Translation cleanup script does not remove empty lines at end.
Solution:   Remove empty lines at the end. (Ken Takata, closes #9794)

src/po/cleanup.vim

@@ -18,7 +18,9 @@ silent g/^msgstr"/s//msgstr "/
 silent g/^msgid"/s//msgid "/
 silent g/^msgstr ""\(\n"\)\@!/?^msgid?,.s/^/#\~ /
 
+" clean up empty lines
 silent g/^\n\n\n/.d
+silent! %s/\n\+\%$//
 
 if s:was_diff
   setl diff

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4412,
 /**/
     4411,
 /**/