patch 8.2.2559: MS-Windows: guifont test fails on Windows XP

Problem:    MS-Windows: guifont test fails on Windows XP.
Solution:   Check windowsversion().
diff --git a/src/testdir/test_gui.vim b/src/testdir/test_gui.vim
index 0d504d5..69f140b 100644
--- a/src/testdir/test_gui.vim
+++ b/src/testdir/test_gui.vim
@@ -388,7 +388,9 @@
     call assert_fails('set guifont=xa1bc23d7f', 'E596:')
   endif
 
-  if exists('+renderoptions')
+  " This only works if 'renderoptions' exists and does not work for Windows XP
+  " and older. 
+  if exists('+renderoptions') && windowsversion() !~ '^[345]\.'
     " doing this four times used to cause a crash
     set renderoptions=type:directx
     for i in range(5)
diff --git a/src/version.c b/src/version.c
index b623c42..67fc08c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2559,
+/**/
     2558,
 /**/
     2557,