MFH: r430779

Fix net-p2p/rtorrent with https trackers

• Bump PORTREVISION for package change

Reference: https://github.com/rakshasa/rtorrent/issues/538
Obtained from: https://github.com/curl/curl/commit/a7b38c9dc98481e4a5fc37e51a8690337c674dfb

Approved by: ports-secteam (junovitch, blanket)