comms/opencbm: Update to 0.4.99.104

• Remove MAJE_JOBS_UNSAFE, fixed upstream with additional make dependencies.
• Remove local copy of opencbm(4), manpage was adopted upstream.
• Also affects opencbm-kmod and opencbm-plugin-xa1541.

Changelog: https://opencbm.trikaliotis.net/opencbm-6.html

Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D36031