Having fixed flags for single-character getopt options is a bit hard to

maintain and is only going to get worse as more are used. So instead, add a new
uint64_t member to cmd_entry which is a bitmask of upper and lowercase options
accepted by the command.

This means new single character options can be used without the need to add it
explicitly to the list.

cmd-if-shell.c

@@ -44,7 +44,7 @@ struct cmd_if_shell_data {
 const struct cmd_entry cmd_if_shell_entry = {
 	"if-shell", "if",
 	"shell-command command",
-	0,
+	0, 0,
 	cmd_if_shell_init,
 	cmd_if_shell_parse,
 	cmd_if_shell_exec,