patch 8.0.1656: no option to have xxd produce upper case variable names

Problem:    No option to have xxd produce upper case variable names.
Solution:   Add the -C argument. (Matt Panaro closes #2772)

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1656,
 /**/
     1655,
 /**/