Calculate number of seconds the package was build in OBS.

Usage (run inside of the complete checkout of the particular
development project):

    $ time-of-build.sh python-Flask

Requires osc and xmlstarlet.

All issues, questions, complaints, or (even better!) patches
should be send via email to
[~mcepl/devel@lists.sr.ht](mailto:~mcepl/devel@lists.sr.ht) email
list (for patches use [git
send-email](https://git-send-email.io/)).