patch 9.0.0255: build failure without the eval feature

Problem:    Build failure without the eval feature.
Solution:   Add #ifdef.
diff --git a/src/version.c b/src/version.c
index a4787e4..17ea79e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -732,6 +732,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    255,
+/**/
     254,
 /**/
     253,