patch 8.1.1463: gcc warns for uninitialized variable

Problem:    Gcc warns for uninitialized variable.
Solution:   Put usage inside "if".  (Ken Takata)
diff --git a/src/version.c b/src/version.c
index ec6ee20..7d86aae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1463,
+/**/
     1462,
 /**/
     1461,