patch 8.2.1986: expression test is flaky on Appveyor

Problem:    Expression test is flaky on Appveyor.
Solution:   Temporarily disable the test in MS-Windows.

Author: brammool

src/testdir/test_vim9_expr.vim

@@ -567,11 +567,14 @@ def Test_expr4_equal()
       assert_equal(false, function('g:Test_expr4_equal', [123]) == function('g:Test_expr4_is', [123]))
       assert_equal(false, function('g:Test_expr4_equal', [123]) == function('g:Test_expr4_equal', [999]))
 
-      var OneFunc: func
-      var TwoFunc: func
-      OneFunc = function('len')
-      TwoFunc = function('len')
-      assert_equal(true, OneFunc('abc') == TwoFunc('123'))
+      # TODO: this unexpectedly sometimes fails on Appveyor
+      if !has('win32')
+        var OneFunc: func
+        var TwoFunc: func
+        OneFunc = function('len')
+        TwoFunc = function('len')
+        assert_equal(true, OneFunc('abc') == TwoFunc('123'))
+      endif
   END
   CheckDefAndScriptSuccess(lines)
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1986,
 /**/
     1985,
 /**/