patch 8.1.2064: MS-Windows: compiler warnings for unused arguments Commit: https://github.com/vim/vim/commit/bd67aac279adf3a1cfa11557229b44e4c2c3dcda Author: Bram Moolenaar <Bram@vim.org> Date: Sat Sep 21 23:09:04 2019 +0200 patch 8.1.2064: MS-Windows: compiler warnings for unused arguments Problem: MS-Windows: compiler warnings for unused arguments. Solution: Add UNUSED. (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/4963)