abc: Exposes dont_use flag in ABC #3892
Merged
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ABC's read_lib command has a dont_use
cell list that is configurable by the user.
This PR exposes that option to Yosys.
See
https://github.com/berkeley-abc/abc/blob/5405d4787a86615de76afccf1356676fb5c56c1c/src/map/scl/scl.c#L285 for documentation on this option.