patch 7.4.1870

Problem:    One more Win64 compiler warning.
Solution:   Change declared argument type. (Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1870,
 /**/
     1869,
 /**/