[objc] Warn if trying to process unsafe code (pointers) or the `DBNull` type (#240)
[objc] Warn if trying to process unsafe code (pointers) or the `DBNull` type (#240)

Warning is better (now) as it let the processing and generation continue
further, i.e. it just skip what it can't process.
jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000