patch 8.0.1490: number of spell regions is spread out through the code

Problem:    Number of spell regions is spread out through the code.
Solution:   Define MAXREGIONS.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1490,
 /**/
     1489,
 /**/