Update devel/abi-compliance-checker to the current git snapshot.
The script now depends on two tools abi-dumper and vtable-dumper. The
only purpose of the tools is to provide neccessary services to the
abi-compliance-checker, so I included all of them into the updated
port, instead of providing dependencies.
Sponsored by: The FreeBSD Foundation
Reviewed, tested and approved by: ehaupt
Differential revision: https://reviews.freebsd.org/D9315