patch 8.1.0842: getchar_zero test fails on MS-Windows

Problem:    getchar_zero test fails on MS-Windows.
Solution:   Disable the test for now.
diff --git a/src/version.c b/src/version.c
index a90d52e..c8bb2f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    842,
+/**/
     841,
 /**/
     840,