patch 8.2.1607: Vim9: getchar() test fails on MS-Windows

Problem:    Vim9: getchar() test fails on MS-Windows.
Solution:   First consume any available input.
diff --git a/src/version.c b/src/version.c
index 70f736d..c306c88 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1607,
+/**/
     1606,
 /**/
     1605,