Don't repeatedly trigger FocusGained on win32

References https://github.com/tpope/vim-fugitive/issues/1209

autoload/fugitive.vim

@@ -2052,8 +2052,10 @@ augroup fugitive_status
   autocmd!
   autocmd ShellCmdPost         * call s:AutoReloadStatus()
   autocmd QuickFixCmdPost c*file call s:AutoReloadStatus()
-  autocmd FocusGained          * call s:AutoReloadStatus()
   autocmd BufDelete     term://* call s:AutoReloadStatus()
+  if !has('win32')
+    autocmd FocusGained        * call s:AutoReloadStatus()
+  endif
 augroup END
 
 function! s:StageInfo(...) abort