patch 9.1.0451: No test for escaping '<' with shellescape()

Problem:  No test for escaping '<' with shellescape()
Solution: Add a test.  Use memcpy() in code to make it easier to
          understand.  Fix a typo (zeertzjq).

closes: #14876

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    451,
 /**/
     450,
 /**/