www/privoxy: Update 4.0.0 => 4.1.0, improve port
Changelog:
https://lists.privoxy.org/pipermail/privoxy-announce/2026-January/000012.html
Improve port:
- Add zstd option and enable it by default.
- Enable the already existing COMPRESSION option by default. It doesn't add additional dependencies and some users may want it.
- Declare licenses.
- Parametrize "privoxy" with "${PORTNAME}".
- Replace "CPPFLAGS" and "LDFLAGS" with USES feature "localbase".
- Change pkg-message to suggest using "onestart" instead of "forcestart" to start Privoxy manually. There is no need for "forcestart".
- Replace PORTVERSION with DISTVERSION.
- Switch to *_CONFIGURE_ENABLE and *_CONFIGURE_WITH.
- Use ${ETCDIR} instead of ${PREFIX}/etc/privoxy.
- Merge MKDIR calls.
- Move install DOCS to do-install-DOCS-on (and merge INSTALL_DATA).
- Move install PRIVOXY_TOOLS to do-install-PRIVOXY_TOOLS-on (and merge INSTALL_SCRIPT).
- Optimize do-install (merge INSTALL_DATA).
- Sort pkg-plist.
PR: 292213
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>