Don't embed `SIOR.IRX` unless it's needed

[israpps]

Pull Request checklist

Note: these are not necessarily requirements

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

Pull Request description

[AKuHAK]

I am not against this pr, but what is its purpose?

[israpps]

I am not against this pr, but what is its purpose?

Don't embed SIOR.IRX if not used

To save a few Kb