patch 9.0.0203: confusing variable name

Problem:    Confusing variable name.
Solution:   Use "prim_aep" instead of "spell_aep".

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    203,
 /**/
     202,
 /**/