patch 8.1.2016: terminal altscreen test now fails on MS-Windows

Problem:    Terminal altscreen test now fails on MS-Windows.
Solution:   Skip the test on MS-Windows
diff --git a/src/version.c b/src/version.c
index 962f0a9..86aaec9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2016,
+/**/
     2015,
 /**/
     2014,