[config] warnings for missing declarations or prototypes now errors
[config] warnings for missing declarations or prototypes now errors

Parrot builds successfully with these warnings elevated to errors.

tkob/parrot,FROGGS/parrot,parrot/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,tkob/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,FROGGS/parrot,FROGGS/parrot,parrot/parrot