patch 8.2.4445: exit test fails on MS-Windows anyway

Problem:    Exit test fails on MS-Windows anyway.
Solution:   Skip the test on MS-Windows.
diff --git a/src/version.c b/src/version.c
index 646f1ed..cb6e8e3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4445,
+/**/
     4444,
 /**/
     4443,