Apio lint breaks in ECP5 projects with the latest Yosys.

[zapta]

Upstream request for help here YosysHQ/yosys#5633

Observed only with ECP5, ICE40 and GOWIN seems to be ok.

[zapta]

The last yosys version that is still good in this respect is 2025-10-08. After that, the ECP5 library file cells_bb.v get broken, lint wise.

[zapta]

Upstream bug report here: YosysHQ/yosys#5637 (comment)

Also, a proposal upstream to include lint testing in yosys automated tests and remove the existing lint warnings. https://yosyshq.discourse.group/t/proposal-automatic-test-for-yosys-cell-libraries/118

[zapta]

Created also an upstream issue for verilator verilator/verilator#6957