Libretro core Windows fix

[raidenii]

Fixes #25

[vadosnaprimer]

If you rebase on upstream devel branch, CI will upload an artifact for this PR, makes it easier to test for others.

[raidenii]

Is this the corresponding CI build?
https://github.com/TASEmulators/freej2me-plus/actions/runs/11574364755

I don't think it builds libretro cores though, so not sure how it would help here.

[vadosnaprimer]

Isn't freej2me-lr.jar the file you need? It uploaded it fine after you pulled.

https://github.com/TASEmulators/freej2me-plus/actions/runs/11579312895/artifacts/2119080902

[raidenii]

No, not really - my commit only deals with freej2me_libretro.c, and the workflow does not build that. I tested it locally myself though on both win32 and linux.

[AShiningRay]

Isn't freej2me-lr.jar the file you need? It uploaded it fine after you pulled.

https://github.com/TASEmulators/freej2me-plus/actions/runs/11579312895/artifacts/2119080902

Java CI won't get those libretro core changes at all, since nothing was changed in the java side, only the C core... i guess we could implement a CI for libretro later, but it's not a priority right now (especially since i don't have a windows machine at the moment so actual testing there will be lacking, as can be seen by this PR).

Now for the PR itself: Amazing work! Seems A-OK on my linux machine as well.

[AShiningRay]

Looks good to me, also made things more readable (at least to me).

[AShiningRay]

Fine by me as well, no complaints.

[AShiningRay]

Well the rest is just cosmetic so i don't see a need to add reviews to them, but they're also fine. Merging since i've found no issues with it. If anything arises on linux (unlikely), i can handle them over here. Thanks a bunch!