patch 9.0.1131: build failure without the +eval feature

Problem:    Build failure without the +eval feature.
Solution:   Move code inside #ifdef.
diff --git a/src/version.c b/src/version.c
index 212d08d..babedcc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1131,
+/**/
     1130,
 /**/
     1129,