patch 8.2.0666: Ruby test fails on MS-Windows

Problem:    Ruby test fails on MS-Windows.
Solution:   Remove the "maintainer" line. (Ken Takata, closes #6015)

src/testdir/shared.vim

@@ -338,4 +338,16 @@ func IsRoot()
   return v:false
 endfunc
 
+" Get all messages but drop the maintainer entry.
+func GetMessages()
+  redir => result
+  redraw | messages
+  redir END
+  let msg_list = split(result, "\n")
+  if msg_list->len() > 0 && msg_list[0] =~ 'Messages maintainer:'
+    return msg_list[1:]
+  endif
+  return msg_list
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab