patch 8.1.0246: 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 3b437c4..a3539f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    246,
+/**/
     245,
 /**/
     244,