Examples: Fix download_low_level_api to be compilable

Examples are not build, so the bug was ignored for long time.

examples/c/download_low_level_api.c

@@ -57,7 +57,10 @@ main(void)
                 NULL,   // Mirror failure callback
                 NULL,   // User's data for the end and mirror failure callbacks
                 0,      // Start of byterange
-                3788       // End of byterange
+                3788,   // End of byterange
+                NULL,   // Range string to download; Overrides Start and End of byterange
+                FALSE,  // Tell proxy server that we don't want to use cache for this request
+                FALSE   // This target is a zchunk file
             );
 
     ret = lr_download_target(target, &tmp_err);