patch 9.1.1021: string might be used without a trailing NUL

Problem:  string might be used without a trailing NUL (after v9.1.0997)
Solution: Make sure that the buffer is NUL terminated

closes: #16457

Signed-off-by: John Marriott <basilisk@internode.on.net>
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 */
+/**/
+    1021,
 /**/
     1020,
 /**/