Fix Odin bindgen type mappings

[Barinzaya]

This affects intptr_t, uintptr_t, and size_t, which are variable-sized. The previous mappings were mapped directly to 64-bit values, and they've been changed to use the corresponding core:c aliases.

This closes #1157. An additional fix is required in sokol-odin itself to correct helpers.Allocator.alloc_fn, which uses u64 for a size_t argument.

[floooh]

Thanks!

@jakubtomsu when you have a minute, can you also have a look in case you have any objections?

(also at: floooh/sokol-odin#22)

[floooh]

Looks like at least one sample needs to be fixed as well:

/home/runner/work/sokol/sokol/examples/instancing/main.odin(126:16) Cannot assign value 'u64(state.cur_num_particles * size_of(m.vec3))' of type 'u64' to 'uint' in structure literal
	size = u64(state.cur_num_particles * size_of(m.vec3)),
	       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^

...but that may be a chicken egg problem (e.g. first commit this MR to update the bindings, then fix the sample(s)).

[jakubtomsu]

yep, looking at the code everything seems fine.

[Barinzaya]

Should I update the sokol-odin PR to include the change to the sample as well, then?

[floooh]

Should I update the sokol-odin PR to include the change to the sample as well, then?

I think that makes sense, even if it might not compile until the sokol PR is merged.

[floooh]

Oki thanks for the PRs. I'm currently busy working an unrelated sokol PR, but I'll try to get this stuff merged tomorrow.

[floooh]

...and that one also merged, watching the CI pipeline out if everything looks in order...

[floooh]

...also thanks for the PR! :)