patch 8.0.1555: build error for some combination of features

Problem:    Build error for some combination of features.
Solution:   Declare variable in more situations.
diff --git a/src/version.c b/src/version.c
index e890d11..9a61422 100644
--- a/src/version.c
+++ b/src/version.c
@@ -779,6 +779,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1555,
+/**/
     1554,
 /**/
     1553,