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)
diff --git a/src/version.c b/src/version.c
index 8403bf4..1c2d802 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1656,
+/**/
     1655,
 /**/
     1654,