add config.h deps to Makefile
add config.h deps to Makefile

I had the case of a missing pbcversion.h but a generated config.h.
Make it clear that these need to be generated.

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