patch 8.1.1808: build failure for tiny version

Problem:    Build failure for tiny version.
Solution:   Define ex_eval to ex_ni.  Clean up the ordering a bit.

src/version.c

@@ -773,6 +773,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1808,
 /**/
     1807,
 /**/