patch 8.0.1227: undefined left shift in readfile()

Problem:    Undefined left shift in readfile(). (Brian 'geeknik' Carpenter)
Solution:   Add cast to unsigned. (Dominique Pelle, closes #2253)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1227,
 /**/
     1226,
 /**/