Request to add "--auth-no-challenge" option from wget to zsync

[rogers0]

Reported to Debian: https://bugs.debian.org/985636

I tried to add zsync to Jenkins artifacts download, but found zsync cannot authenticate with Jenkins due to a limitation [1]. However, wget can download with option "--auth-no-challenge". So here I request to add similar option to zsync client as well. Thanks!

[1] https://www.jenkins.io/doc/book/system-administration/authenticating-scripted-clients