vim: Import v8.0.1351

* 8.0.1351: warning for unused variables building with MinGW
* 8.0.1350: cannot build with +eval and -multi_byte

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.0.1349](https://github.com/vim/vim/releases/tag/v8.0.1349): options test fails when using Motif or GTK GUI\n* [8.0.1348](https://github.com/vim/vim/releases/tag/v8.0.1348): make testclean deletes script file on MS-Windows\n* [8.0.1347](https://github.com/vim/vim/releases/tag/v8.0.1347): MS-Windows: build broken by misplaced curly\n* [8.0.1346](https://github.com/vim/vim/releases/tag/v8.0.1346): crash when passing 50 char string to balloon_split()\n* [8.0.1345](https://github.com/vim/vim/releases/tag/v8.0.1345): race condition between stat() and open() for viminfo\n* [8.0.1344](https://github.com/vim/vim/releases/tag/v8.0.1344): using 'imactivatefunc' in the GUI does not work\n* [8.0.1343](https://github.com/vim/vim/releases/tag/v8.0.1343): MS-Windows: does not show colored emojis
+* [8.0.1351](https://github.com/vim/vim/releases/tag/v8.0.1351): warning for unused variables building with MinGW\n* [8.0.1350](https://github.com/vim/vim/releases/tag/v8.0.1350): cannot build with +eval and -multi_byte