Update devel/abi-compliance-checker to recent releases

There was an important release of abi-dumper with fixes
in November 2020; otherwise the compatibility results using
"new" style are bogus.

Not taking this port as I don't think it's useful enough on FreeBSD;
clang-compatibility is an issue and parts of the tool demand
gcc 4.5.8 (the port doesn't handle that gracefully either).