Revision 506842

MFH: r506727

net-im/toxic: drop unused dependencies, unbreak PYTHON option

- Remove security/libsodium and audio/opus dependencies;
the port does not reference nor links against them.
- Allow to use ncurses from base (if possible).
- Patch python3 detection to use proper pkgconfig/python3-config and
bin/python3 paths.
- Move USES upper (portlint).
- Bump PORTREVISION.

PR:		239215
Approved by:	portmgr (blanket(s): dependencies, build fix(es))