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)
diff --git a/src/version.c b/src/version.c
index 5786860..5d41702 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1470,
+/**/
     1469,
 /**/
     1468,