[circt-synth] Disable test if yosys-abc unavailable #9295
Merged
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I ran into a situation on my machine where yosys was installed, but yosys-abc was not. Since the
circt-synth/abc.mlirtest only requires yosys-abc, add a separate feature flag and perform and additional check to see if yosys-abc is installed alongside yosys. If it is not, disable that test.