Bug:

Bindgen infers the type of 0xFFull << 60 incorrectly as s64.

Steps to repro:

1. The repo already contains manually fixed bindings with which the program works.
2. Run jai generate.jai to run it and see it work.
3. Go to generate.jai and uncomment out the section for generating bindings.
4. Run jai generate.jai and see it fail on

Error: In a constant-expression cast, the bounds check failed. Number must be in [0, 4294967295], but it was 0xfffffffff0000000.

    flecs_iter_cache_all :: 255;
    ECS_MAX_COMPONENT_ID :: ~(cast(u32) (ECS_ID_FLAGS_MASK >> 32));

This is incorrect, because ECS_ID_FLAGS_MASK is a 0xFFull << 60

5. Go to flecs.h and on line 31867 add an explicit (uint64_t) cast, this makes bindgen do the right thing.
6. Re-run jai generate to see the error fixed. Now there will be new errors with undefined va_list. Manually commenting out all of these bindings (there's only 10 or so) fixes the problem, after which the program runs.