issues with new CMake based build

First, I like rather like the cmake change. On Ubuntu 26.04 it compiles without issues, by just following the instructions (I might have installed some dependencies for other projects). On Ubuntu 24.04 there is a missing dependency, to be solved by: ``` sudo apt install libgmock-dev ``` The `yosys` version was reverted to at `0.64` during the marge of `cmake` changes into master, it should be `0.66`.