Fix wrong soname version for `libcurl3t64-gnutls` and introduce `libcurl4-gnutls`

Sergio Durigan Juniorrequested to merge
sergiodj/curl:bump-libcurl-gnutls-soname-4 into debian/unstable

Alright, this is now ready. I'm going to merge it and upload to unstable. Here goes nothing!

Closes: #1020780

Edited by Sergio Durigan Junior

Merge request reports