Exclude JIT-related declarations more aggressively

[JesseTG]

This reduces the risk of linker errors occurring when building on ARM without the JIT.

[Adamillo]

That makes me curious. Does this mean that someone could now theoretically use melonDS on ARMv7 aka 32-bit ARM with no JIT?

[JesseTG]

Dunno. This PR isn't intended to support new platforms, it just makes the build process for already-supported platforms less likely to break. That's what's been happening with melonDS DS.

[Adamillo]

I see. The reason I ask is that on platforms like x86_32 you can use melonDS with the JIT disabled. I'd imagine that you'd be able to do the same with ARM32 now that the linker errors are fixed

[JesseTG]

Maybe. I've never tried to build melonDS (upstream, libretro core, or any other port) on 32-bit ARM. I suppose this PR would theoretically make that simpler by virtue of the reduced risk of breakage.

[RSDuck]

That makes me curious. Does this mean that someone could now theoretically use melonDS on ARMv7 aka 32-bit ARM with no JIT?

you could already do that before. Besides maybe some small slip up the JIT is fully disableable

[JesseTG]

And this PR fixes some sources of small slip-ups.