emu/save.cpp: Make illegal save state registrations always fatal #12054
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The only thing that causes non-fatal illegal save state registrations right now is registering an item for save states after start in a system not marked as supporting save states.
It’s high time anything doing that gets fixed. Not supporting save states means save state support is incomplete, not that the driver has a license to do illegal things.
Opening this as a pull request to give fair warning, and so it can be merged after freeze.