vim: Import v8.1.0412

* 8.1.0412: cannot build with GTK 2.4
* 8.1.0411: renamed file missing from distribution
* 8.1.0410: the ex_copen() function is too long
* 8.1.0409: startup test fails on MS-Windows

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.1.0408](https://github.com/vim/vim/releases/tag/v8.1.0408): MSVC: cannot use the "x64" native compiler option\n* [8.1.0407](https://github.com/vim/vim/releases/tag/v8.1.0407): quickfix code mixes using the stack and a list pointer\n* [8.1.0406](https://github.com/vim/vim/releases/tag/v8.1.0406): several command line arguments are not tested\n* [8.1.0405](https://github.com/vim/vim/releases/tag/v8.1.0405): too many #ifdefs for GTK\n* [8.1.0404](https://github.com/vim/vim/releases/tag/v8.1.0404): accessing invalid memory with long argument name\n* [8.1.0403](https://github.com/vim/vim/releases/tag/v8.1.0403): header file missing from distribution\n* [8.1.0402](https://github.com/vim/vim/releases/tag/v8.1.0402): the DiffUpdate event isn't triggered for :diffput
+* [8.1.0412](https://github.com/vim/vim/releases/tag/v8.1.0412): cannot build with GTK 2.4\n* [8.1.0411](https://github.com/vim/vim/releases/tag/v8.1.0411): renamed file missing from distribution\n* [8.1.0410](https://github.com/vim/vim/releases/tag/v8.1.0410): the ex_copen() function is too long\n* [8.1.0409](https://github.com/vim/vim/releases/tag/v8.1.0409): startup test fails on MS-Windows