patch 8.0.0658: spell test is old style

Problem:    Spell test is old style.
Solution:   Turn the spell test into a new style test (pschuh, closes #1778)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    658,
 /**/
     657,
 /**/