UPM-wrapped copy of Unity.IL2CPP.CompilerServices.Il2CppSetOptionAttribute,
because Unity makes you manually copy it from its installation
for some reason.
If this attribute is added to any core Unity module or to any publicly-listed UPM package from the official Unity registry, then I will remove this package from OpenUPM. You have my preemptive permission to do it for me if I forget to.