scalar: parse `clone --no-fetch-commits-and-trees` for backwards compatibility

This option does not do anything anymore, though.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

scalar.c

@@ -680,6 +680,7 @@ static int init_shared_object_cache(const char *url,
 
 static int cmd_clone(int argc, const char **argv)
 {
+	int dummy = 0;
 	const char *branch = NULL;
 	int full_clone = 0, single_branch = 0, show_progress = isatty(2);
 	int src = 1;
@@ -701,6 +702,8 @@ static int cmd_clone(int argc, const char **argv)
 		OPT_STRING(0, "local-cache-path", &local_cache_root,
 			   N_("<path>"),
 			   N_("override the path for the local Scalar cache")),
+		OPT_HIDDEN_BOOL(0, "no-fetch-commits-and-trees",
+				&dummy, N_("no longer used")),
 		OPT_END(),
 	};
 	const char * const clone_usage[] = {