devel/radare2: Update to 2.8.0
While here, unbreak on arm64
This was broken because of the debugger part of radare2.
Those patches fix that even if the debugger still doesn't work
due to lack of some ptrace function in the FreeBSD aarch64 port.
The patches were submitted and commited upstream.
Reviewed by: email@example.com (Maintainer)
Approved by: brd
Differential Revision: https://reviews.freebsd.org/D16656