vim-patch:8.2.0047: cannot skip tests for specific MS-Windows platform (#13461)

Problem:    Cannot skip tests for specific MS-Windows platform.
Solution:   Add windowsversion().
0c1e3744ff

src/nvim/eval.lua

@@ -392,6 +392,7 @@ return {
     win_screenpos={args=1},
     winbufnr={args=1},
     wincol={},
+    windowsversion={},
     winheight={args=1},
     winlayout={args={0, 1}},
     winline={},