Fixed error caused by change to the parent class of Icarus_g2005.

[dicethrow]

The error I got was that self.compile_args is now a dictionary,
rather than an array. Although self.compile_args_flattened seemed
to work, I wasn't sure if there were other changes in the parent
class that I didn't find.

So this commit was implemented to reduce the reliance on the internal
structure of the parent class.

[akukulanski]

Hi,
Here I see that self.compile_args is still a list. Where should I look for that change?

Still, it's true that with the current implementation any change in the parent class can break this so 👍 to this PR.

What do you think @andresdemski ?

[dicethrow]

Ah my apologies, I referred to the wrong thing in the comment above. It was self.verilog_sources that is now a dictionary, and a list form of it is now self.verilog_sources_flat, these are both in the link you shared.

[akukulanski]

You're right, I didn't see that!