Segfault on macOS

[HanyzPAPU]

The clear_history() call in input.c:188 segfaults when msim is compiled on mac.

I found out that this is caused because instead of GNU Readline, macOS is distributed with BSD editline, which provides a mock implementation if the readline API.
There is one crucial difference: the editline mock does not call the using_history() (link) function and thus does not initialize the history state.

Adding the using_history() call to the initializer solves the issue.
An alternative solution would be to manually link msim with readline instead of relying on the system library.

[HanyzPAPU]

Would it be safe to call using_history() even with GNU Readline? The history would technically get initialized twice.

[vhotspur]

Looking at the documentation and into the official examples I think we should call using_history ourselves and it is a bug to not call it.

Generally I would prefer if we would be able to work with the editline to simplify the building process a bit.

Perhaps we should add building on Mac to our GitHub Actions too?

[HanyzPAPU]

From what I've seen, there were one or two students using Mac each year. I think it would be a good idea to have MSIM prebuilt for them.