__API_SCILAB_UNSAFE__ makes binding generation hard

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This code disallows a binding generator to include both options

#ifdef API_SCILAB_UNSAFE
#define API_PROTO(x) scilab_internal_##x##unsafe
#define API_EXPORT_PROTO(x) scilab##x
#else
#define API_PROTO(x) scilab_internal_##x##safe
#define API_EXPORT_PROTO(x) scilab##x
#endif

This decision should be left to the caller of the generated bindings and not imposed on the generator