Document .tar.bz2 requirement, requested by wiz.
Work around the xdg-desktop-menu being completely useless wrt. pkgsrc.
Fix absolute paths in desktop file.
Bump PKGREVISION.
C.F. pkg/47523
Fix previous, it didn't work as intended. Just having /usr/lib${LIBABISUFFIX}
there should be sufficient, and it works.
Bump libssh dependency.  Fixes bulk builds.