www/gnurl: Update to 7.65.3

Changelog:

* make the warning in buildconf more clear, month
  after noting that the hardfailure was not necessary.
* comment nroff parts of configure script, build +
  check + release without groff tested succesfully on NetBSD 9.99.4
* Dependencies: python-3 is now supported (should be in curl
  as well) for the tests. If python is required at all for
  the tests needs to be looked at more closely. groff/nroff dropped.

The usual curl Changelog applies, consult https://curl.haxx.se for the
ChangeLog.

(ng0)