patch 8.1.2028: options test script does not work

Problem:    Options test script does not work.
Solution:   Use optiondefs.h for input.
diff --git a/src/version.c b/src/version.c
index 929a4c6..f76dde7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2028,
+/**/
     2027,
 /**/
     2026,