Update khal to 0.9.8. Previous version was marked BROKEN due to
missing (versioned) dependencies. This version works with the
current deskutils/py-vdirsyncer.

• Also switch to DISTVERSION
• Minor fixes in Makefile, alphabetizing
• Updated dependencies
• Optional (non-default) dependency on setproctitle

Move maintainership from upstream to lbdm.

PR: 221736 224732
Submitted by: lbdm@privacychain.ch
Reviewed by: che@bein.link (maintainer) adridg
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D13432