patch 8.2.1608: Vim9: getchar() test fails with GUI

Problem:    Vim9: getchar() test fails with GUI.
Solution:   Avoid that getchar(0) gets stuck on K_IGNORE.
diff --git a/src/version.c b/src/version.c
index c306c88..e1cdba6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1608,
+/**/
     1607,
 /**/
     1606,