Merge remote-tracking branch 'origin/feat/rsync-secluded-args' into dev

# Conflicts:
#	RSYNC_COMPAT.md
#	tests/test_client_cli.c

src/client/usage.c

@@ -37,6 +37,7 @@ void print_usage(void) {
          DELTA_MAX_FILE_SIZE);
   printf("  -m                  Enable multithreading\n");
   printf("  -s                  Enable chunk serialization\n");
+  printf("  --secluded-args    Accept rsync compatibility option (no effect)\n");
   printf("  -f                  Enable sendfile (TCP only, not with -c or -s)\n");
   printf("  -v, --verbose       Enable debug logging\n");
   printf("  -q, --quiet         Suppress non-error output\n");