patch 8.0.1470: integer overflow when using regexp pattern

Problem:    Integer overflow when using regexp pattern. (geeknik)
Solution:   Use a long instead of int. (Christian Brabandt, closes #2251)

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1470,
 /**/
     1469,
 /**/