Heads-up: ABI changed, rebuild needed

[Ludovic Courtès]

Hi!

With the changes resulting from <https://issues.guix.gnu.org/59390>,
specifically commit 7c1161dba4c8930d3a500a72ccaaaf50df73f466, the record
ABI has changed so we need to run:

  make clean-go && make

Ludo’.