net/openbgpd8: update 8.6 -> 8.8

• add BGPLGD option for the looking glass daemon

PR: 285527
Changes: https://marc.info/?l=openbsd-announce&m=173444528418097&w=2

		https://marc.info/?l=openbsd-announce&m=173887198302373&w=2

Reviewed-by: Tim Hogard <thogard@abnormal.com>