patch 9.0.1424: unused macros are defined

Problem:    Unused macros are defined.
Solution:   Remove the unused macros.
diff --git a/src/version.c b/src/version.c
index 3b93819..2438733 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1424,
+/**/
     1423,
 /**/
     1422,