Replace int -> _Bool in goblint stubs arguments

[sim642]

Follow-up on #1682 (comment).

The replacement is straightforward but many tests seem to have failed, so this change is not as easy as it seemed.

TODO

• Are there pre-C11 compatibility issues?
• Fix all tests.
• Less hacky removal of _Bool casts? Try in LibraryFunctions.

[sim642]

Doing the _Bool cast stripping in LibraryFunctions doesn't completely work: EvalInt query on non-integers (like pointers) returns Bot to indicate the type mismatch instead of forcing it to an integer.

Having the assert analysis query with the cast added back (but not printed) seems to fix the issue, but I don't know of good of an idea that is.
The tests don't reveal this, but some analyses answer the EvalInt query by pattern matching on some binary expression. This no longer matches if there's a cast slapped in front.

One possibility to having Queries.eval_bool only add the cast for non-integer expressions (so binary comparisons don't get one). On the other hand, this makes things less consistent.
It also brings up the question whose responsibility it is to guarantee/handle/check what: the query asker or the query answerer.