vim: Import v8.1.1471

* 8.1.1471: 'background' not correctly set for 2-digit rgb termresponse
* 8.1.1470: new Unicode character U32FF missing from double-width table
* 8.1.1469: no test for checking the cursor style response
* 8.1.1468: the generated desktop files may be invalid

gitlog.txt

@@ -1 +1 @@
-* [8.1.1467](https://github.com/vim/vim/releases/tag/v8.1.1467): cscope test fails\n* [8.1.1466](https://github.com/vim/vim/releases/tag/v8.1.1466): not updating priority on existing sign\n* [8.1.1465](https://github.com/vim/vim/releases/tag/v8.1.1465): allocating wrong amount of memory\n* [8.1.1464](https://github.com/vim/vim/releases/tag/v8.1.1464): only 4-digit rgb termresponse is recognized\n* [8.1.1463](https://github.com/vim/vim/releases/tag/v8.1.1463): gcc warns for uninitialized variable\n* [8.1.1462](https://github.com/vim/vim/releases/tag/v8.1.1462): MS-Windows: using special character requires quoting
+* [8.1.1471](https://github.com/vim/vim/releases/tag/v8.1.1471): 'background' not correctly set for 2-digit rgb termresponse\n* [8.1.1470](https://github.com/vim/vim/releases/tag/v8.1.1470): new Unicode character U32FF missing from double-width table\n* [8.1.1469](https://github.com/vim/vim/releases/tag/v8.1.1469): no test for checking the cursor style response\n* [8.1.1468](https://github.com/vim/vim/releases/tag/v8.1.1468): the generated desktop files may be invalid