Use libjpg addons for loading JPEG files

[fjtrujy]

Pull Request checklist

• I reformatted the code with clang-format
• I checked to make sure my submission worked
• I am the author of submission or have permission from the original author
• Requires update of the PS2SDK
• Requires update of the PS2SDK-ports
• Requires update of the gsKit
• Others (please specify below)

Pull Request description

This PR just removes custom loading jpg files using now, the addons library created specifically for it.

This PR ps2dev/ps2sdk-ports#71 needs to be merged before continue

Thanks

[rickgaiser]

Same here as with OPL:
I thought the libjpeg_addons was for compatibility, but it looks like a lot of changes are still needed. Why don't we use libjpeg-turbo directly in this case if we're already changing the code so much?

[fjtrujy]

Well I actually just changed few lines of code, the rest is just indentation changes.
The main reason why I didn't keep same "contract" it is because it was crappy, and I decided to create something easy to use instead.