misc/far2l: update Far2L to version 2.6.1 (on the edge) + hotfix

Apparently, regardless of the search method, when LibArchive is
installed from ports, it would be picked over the base version,
so put `libarchive' on the USES list unconditionally, to avoid
unregistered dependency when building in an unclean environment.

Prefer find_package() vs. pkg_search_module() because the former
prints explicit "found" status message with the library path and
version, if available, which makes more informative build logs.

Reported by: portscout